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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, 2016
Mar. 31, 2015
U.S. defined benefit plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 5 $ 6
Interest cost 11 10
Expected return on plan assets (10) (12)
Recognized net actuarial loss 5 5
Amortization of prior service cost (credit) 0 0
Net periodic benefit costs 11 9
Settlement losses 6 1
Total 17 10
U.S. retiree health care plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 1 1
Interest cost 5 5
Expected return on plan assets (5) (5)
Recognized net actuarial loss 2 2
Amortization of prior service cost (credit) (1) 1
Net periodic benefit costs 2 4
Settlement losses 0 0
Total 2 4
Non-U.S. defined benefit plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 8 9
Interest cost 13 13
Expected return on plan assets (17) (19)
Recognized net actuarial loss 6 6
Amortization of prior service cost (credit) 0 0
Net periodic benefit costs 10 9
Settlement losses 1 0
Total $ 11 $ 9