Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Details 5)

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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Details 5) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure    
Contributions expected to be made in next fiscal year $ 32  
Estimated future benefit payments for funded and unfunded plans    
2019 501  
2020 509  
2021 519  
2022 525  
2023 535  
2024-2028 $ 2,767  
Assumed health care cost trend rates    
Health care cost trend rate assumed for the next year (as a percent) 7.00% 7.00%
Rate at which the cost trend rate is assumed to decline, the ultimate trend rate (as a percent) 5.00% 5.00%
Year in which the rate reaches the ultimate trend rate 2023 2022
Pension benefits    
Estimated future benefit payments for funded and unfunded plans    
2019 $ 439  
2020 448  
2021 460  
2022 468  
2023 480  
2024-2028 2,517  
Other benefits    
Estimated future benefit payments for funded and unfunded plans    
2019 62  
2020 61  
2021 59  
2022 57  
2023 55  
2024-2028 250  
Estimated federal subsidies expected to be received under the Medicare Prescription Drug, Improvement and Modernization Act of 2003, for the period 2019-2023 3  
Estimated federal subsidies expected to be received under the Medicare Prescription Drug, Improvement and Modernization Act of 2003, for the period 2024-2028 $ 2