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Employee Retirement Plans (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 25 $ 25
Interest cost 37 32
Expected return on plan assets (43) (47)
Amortization of prior service cost (credit) 2 2
Total pension and postretirement benefit expense 21 12
Postretirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 2 3
Interest cost 7 6
Amortization of prior service cost (credit) (2) (1)
Total pension and postretirement benefit expense $ 7 $ 8