Supplemental Other Comprehensive Income (Loss) Information - Schedule of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Comprehensive Income (Loss), before Tax [Abstract]
Total Other comprehensive income (loss), before-tax	$ 288	$ (259)	$ (314)
Other comprehensive income (loss), net of tax:
Total Other comprehensive income (loss), net-of-tax	325	(230)	(443)
Remeasurement Due To Change in Foreign Exchange Rates [Abstract]
Loss (gain) related to the remeasurement of fixed interest rate and devaluation-protected bonds in Venezuela		50
Cumulative translation adjustments
Other Comprehensive Income (Loss), before Tax [Abstract]
OCI, before reclassifications, before-tax	218	(97)	(721)
Reclassification from accumulated other comprehensive income, before-tax	0	0	111
Total Other comprehensive income (loss), before-tax	218	(97)	(610)
Other comprehensive income (loss), net of tax:
OCI, before reclassifications, net-of-tax	285	(125)	(745)
Reclassification from accumulated other comprehensive income, net-of-tax	0	0	111
Total Other comprehensive income (loss), net-of-tax	285	(125)	(634)
Pension and other benefits
Other Comprehensive Income (Loss), before Tax [Abstract]
Total Other comprehensive income (loss), before-tax	92	(168)	308
Other comprehensive income (loss), net of tax:
Total Other comprehensive income (loss), net-of-tax	54	(109)	196
Net actuarial gain (loss), prior service costs and settlements during the period
Other Comprehensive Income (Loss), before Tax [Abstract]
OCI, before reclassifications, before-tax	21	(231)	182
Other comprehensive income (loss), net of tax:
OCI, before reclassifications, net-of-tax	9	(152)	115
Amortization of net actuarial loss, transition and prior service costs
Other Comprehensive Income (Loss), before Tax [Abstract]
Reclassification from accumulated other comprehensive income, before-tax	(71)	(63)	(82)
Other comprehensive income (loss), net of tax:
Reclassification from accumulated other comprehensive income, net-of-tax	(45)	(43)	(52)
Available-for-sale securities
Other Comprehensive Income (Loss), before Tax [Abstract]
OCI, before reclassifications, before-tax	0	0	(18)
Reclassification from accumulated other comprehensive income, before-tax	0	(1)	14
Total Other comprehensive income (loss), before-tax	0	(1)	(14)
Other comprehensive income (loss), net of tax:
OCI, before reclassifications, net-of-tax	0	0	(12)
Reclassification from accumulated other comprehensive income, net-of-tax	0	(1)	11
Total Other comprehensive income (loss), net-of-tax	0	(1)	(7)
Cash flow hedges
Other Comprehensive Income (Loss), before Tax [Abstract]
OCI, before reclassifications, before-tax	(25)	11	18
Reclassification from accumulated other comprehensive income, before-tax	3	(4)	(16)
Total Other comprehensive income (loss), before-tax	(22)	7	2
Other comprehensive income (loss), net of tax:
OCI, before reclassifications, net-of-tax	(16)	8	12
Reclassification from accumulated other comprehensive income, net-of-tax	2	(3)	(10)
Total Other comprehensive income (loss), net-of-tax	(14)	5	2
Venezuela Deconsolidation | Reclassification
Other Comprehensive Income (Loss), before Tax [Abstract]
Reclassification from accumulated other comprehensive income, before-tax	0	0	44
Other comprehensive income (loss), net of tax:
Reclassification from accumulated other comprehensive income, net-of-tax	0	0	29
Venezuela Deconsolidation | Available-for-sale securities
Other Comprehensive Income (Loss), before Tax [Abstract]
Reclassification from accumulated other comprehensive income, before-tax	0	0	(10)
Other comprehensive income (loss), net of tax:
Reclassification from accumulated other comprehensive income, net-of-tax	$ 0	$ 0	$ (6)