Pension and Postretirement Benefit Plans - Reconciliation of Level 3 Pension Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value at beginning of period	$ 1,533
Fair value at end of period	1,505	$ 1,533
Foreign Pension Plan [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value at beginning of period	40	44
Fair value at end of period	51	40
Fair Value, Inputs, Level 3 [Member] | Foreign Pension Plan [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value at beginning of period	12
Fair value at end of period	16	12
Fair Value, Inputs, Level 3 [Member] | Foreign Pension Plan [Member] | Insurance Contracts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value at beginning of period	12	10
Currency impact		(1)
Transfers into (out of) Level 3	4	3
Fair value at end of period	$ 16	$ 12