Annual report pursuant to Section 13 and 15(d)

FAIR VALUE MEASUREMENTS (Details)

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FAIR VALUE MEASUREMENTS (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Assets and liabilities measured at fair value on a recurring basis      
Debt Securities $ 3,328,000,000 $ 5,037,000,000  
Equity Method Investment, Other than Temporary Impairment 710,000,000 591,000,000  
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (Loss), Net     $ 150,000,000
Derivative, Collateral, Obligation to Return Cash 261,000,000 96,000,000  
Derivative, Collateral, Right to Reclaim Cash   4,000,000  
Level 1      
Assets and liabilities measured at fair value on a recurring basis      
Equity securities with changes in fair value recognized in income 1,877,000,000 1,681,000,000  
Debt Securities 0 0  
Derivatives 9,000,000 2,000,000  
Total assets 1,886,000,000 1,683,000,000  
Derivatives 0 (14,000,000)  
Total liabilities 0 (14,000,000)  
Level 2      
Assets and liabilities measured at fair value on a recurring basis      
Equity securities with changes in fair value recognized in income 219,000,000 186,000,000  
Debt Securities 3,291,000,000 5,018,000,000  
Derivatives 579,000,000 313,000,000  
Total assets 4,089,000,000 5,517,000,000  
Derivatives (162,000,000) (221,000,000)  
Total liabilities (162,000,000) (221,000,000)  
Level 3      
Assets and liabilities measured at fair value on a recurring basis      
Equity securities with changes in fair value recognized in income 14,000,000 6,000,000  
Debt Securities 37,000,000 19,000,000  
Derivatives 0 0  
Total assets 51,000,000 25,000,000  
Derivatives 0 0  
Total liabilities 0 0  
Other [Member]      
Assets and liabilities measured at fair value on a recurring basis      
Equity securities with changes in fair value recognized in income 109,000,000 61,000,000  
Debt Securities 0 0  
Derivatives 0 0  
Total assets 109,000,000 61,000,000  
Derivatives 0 0  
Total liabilities 0 0  
Netting Adjustment      
Assets and liabilities measured at fair value on a recurring basis      
Equity securities with changes in fair value recognized in income 0 0  
Debt Securities 0 0  
Derivatives (392,000,000) (261,000,000)  
Total assets (392,000,000) (261,000,000)  
Derivatives 130,000,000 182,000,000  
Total liabilities 130,000,000 182,000,000  
Fair Value Measurements      
Assets and liabilities measured at fair value on a recurring basis      
Equity securities with changes in fair value recognized in income 2,219,000,000 1,934,000,000  
Debt Securities 3,328,000,000 5,037,000,000  
Derivatives 196,000,000 54,000,000  
Total assets 5,743,000,000 7,025,000,000  
Derivatives (32,000,000) (53,000,000)  
Total liabilities (32,000,000) (53,000,000)  
Other assets | Fair Value Measurements      
Assets and liabilities measured at fair value on a recurring basis      
Derivatives 196,000,000 54,000,000  
Accounts Payable and Accrued Liabilities | Fair Value Measurements      
Assets and liabilities measured at fair value on a recurring basis      
Derivatives   3,000,000  
Other liabilities | Fair Value Measurements      
Assets and liabilities measured at fair value on a recurring basis      
Derivatives 32,000,000 50,000,000  
Pension benefits      
Assets and liabilities measured at fair value on a recurring basis      
Defined Benefit Plan, Plan Assets, Amount $ 8,080,000,000 $ 7,429,000,000 $ 8,866,000,000