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, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure    
Contributions expected to be made in next fiscal year $ 59  
Estimated future benefit payments for funded and unfunded plans    
2018 777  
2019 523  
2020 543  
2021 548  
2022 557  
2023-2027 $ 2,900  
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 2022 2021
Pension benefits    
Estimated future benefit payments for funded and unfunded plans    
2018 $ 713  
2019 461  
2020 482  
2021 489  
2022 500  
2023-2027 2,642  
Other benefits    
Estimated future benefit payments for funded and unfunded plans    
2018 64  
2019 62  
2020 61  
2021 59  
2022 57  
2023-2027 258  
Estimated federal subsidies expected to be received under the Medicare Prescription Drug, Improvement and Modernization Act of 2003, for the period 2018-2022 4  
Estimated federal subsidies expected to be received under the Medicare Prescription Drug, Improvement and Modernization Act of 2003, for the period 2023-2027 $ 3