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Employee Benefit Plans - Change in Benefit Obligation (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Benefits        
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit obligation — beginning of year   $ 4,376 $ 5,650  
Service cost   4 4 $ 2
Interest cost   142 170 237
Plan participants’ contributions   0 0  
Actuarial (gain) loss   (6) 139  
Plan Amendment $ (1,600)      
Settlements   0 (1,647)  
Changes in assumptions   (329) 332  
Benefits and expenses paid   (186) (273)  
Retiree drug subsidy   0 0  
Foreign exchange adjustment   (1) 1  
Benefit obligation — end of year   4,000 4,376 5,650
Other Postretirement Benefits        
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit obligation — beginning of year   256 272  
Service cost   0 0  
Interest cost   7 8 11
Plan participants’ contributions   11 11  
Actuarial (gain) loss   0 5  
Settlements   0 0  
Changes in assumptions   (11) 10  
Benefits and expenses paid   (45) (51)  
Retiree drug subsidy   2 1  
Foreign exchange adjustment   0 0  
Benefit obligation — end of year   $ 220 $ 256 $ 272