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Employee Benefit Plans - Change in Benefit Obligation (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pension Benefits        
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit obligation — beginning of year   $ 5,650 $ 5,734  
Service cost   4 2 $ 2
Interest cost   170 237 235
Plan participants’ contributions   0 0  
Actuarial loss   139 9  
Settlements $ (1,600) (1,647) 0  
Plan Amendment   0 0  
Changes in assumptions   332 (30)  
Benefits and expenses paid   (273) (303)  
Retiree drug subsidy   0 0  
Foreign exchange adjustment   1 1  
Benefit obligation — end of year   4,376 5,650 5,734
Other Postretirement Benefits        
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit obligation — beginning of year   272 301  
Service cost   0 0  
Interest cost   8 11 12
Plan participants’ contributions   11 25  
Actuarial loss   5 4  
Settlements   0 0  
Plan Amendment   0 (1)  
Changes in assumptions   10 0  
Benefits and expenses paid   (51) (68)  
Retiree drug subsidy   1 0  
Foreign exchange adjustment   0 0  
Benefit obligation — end of year   $ 256 $ 272 $ 301