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Postretirement Benefit Plans - Expense Related to Defined Benefit and Retiree Health Care Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
U.S. | Defined benefit plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 5 $ 5
Interest cost 9 10
Expected return on plan assets (11) (10)
Recognized net actuarial loss 4 4
Amortization of prior service credit 0 0
Net periodic benefit costs 7 9
Settlement losses 2 6
Total, including other postretirement losses 9 15
U.S. | Retiree health care plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 1 1
Interest cost 4 4
Expected return on plan assets (4) (4)
Recognized net actuarial loss 1 1
Amortization of prior service credit (1) (1)
Net periodic benefit costs 1 1
Settlement losses 0 0
Total, including other postretirement losses 1 1
Non-U.S. | Defined benefit plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 9 9
Interest cost 12 11
Expected return on plan assets (17) (16)
Recognized net actuarial loss 5 7
Amortization of prior service credit 0 0
Net periodic benefit costs 9 11
Settlement losses 0 0
Total, including other postretirement losses $ 9 $ 11