Supplemental Other Comprehensive Income (Loss) Information - Schedule of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total Other comprehensive income (loss), net of tax	$ (189)	$ 342	$ (242)
Cumulative translation adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss), Pretax	(233)	218	(97)
Total Other comprehensive income (loss), net of tax	(218)	285	(125)
Pension and other benefits
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss), before reclassifications, Pretax	(21)	21	(231)
Reclassification from AOCI, Pretax	69	71	63
Other comprehensive income (loss), Pretax	48	92	(168)
Other comprehensive income (loss), before reclassifications, Net of Tax	(16)	9	(152)
Reclassification from AOCI, Net of Tax	54	45	43
Total Other comprehensive income (loss), net of tax	38	54	(109)
Available-for-sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from AOCI, Pretax	0	0	(1)
Other comprehensive income (loss), Pretax	0	0	(1)
Reclassification from AOCI, Net of Tax	0	0	(1)
Total Other comprehensive income (loss), net of tax	0	0	(1)
Cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss), before reclassifications, Pretax	10	(25)	11
Reclassification from AOCI, Pretax	3	3	(4)
Other comprehensive income (loss), Pretax	13	(22)	7
Other comprehensive income (loss), before reclassifications, Net of Tax	8	(16)	8
Reclassification from AOCI, Net of Tax	2	2	(3)
Total Other comprehensive income (loss), net of tax	10	(14)	5
Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss), Pretax	(172)	288	(259)
Total Other comprehensive income (loss), net of tax	$ (170)	$ 325	$ (230)