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, 2016
Dec. 31, 2015
Estimated future benefit payments for funded and unfunded plans    
2017 $ 639  
2018 562  
2019 588  
2020 603  
2021 616  
2022-2026 $ 3,229  
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 2021 2021
Pension benefits    
Estimated future benefit payments for funded and unfunded plans    
2017 $ 574  
2018 496  
2019 521  
2020 536  
2021 549  
2022-2026 2,906  
Other benefits    
Estimated future benefit payments for funded and unfunded plans    
2017 65  
2018 66  
2019 67  
2020 67  
2021 67  
2022-2026 323  
Estimated federal subsidies expected to be received under the Medicare Prescription Drug, Improvement and Modernization Act of 2003, for the period 2017-2021 4  
Estimated federal subsidies expected to be received under the Medicare Prescription Drug, Improvement and Modernization Act of 2003, for the period 2022-2026 3  
United States Pension Plan of US Entity [Member]    
Defined Benefit Plan Disclosure    
Contributions expected to be made in next fiscal year $ 106