Accumulated Other Comprehensive Loss and Shareholders' Equity - Accumulated Other Comprehensive (Loss) Income Activity (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	$ 2,225	$ 3,731
Other comprehensive income (loss) before reclassifications	32	149
Reclassification of (income) losses	(1)	13
Net other comprehensive income (loss)	31	162
Balance at end of period	1,603	3,588
Other comprehensive income (loss) before reclassification related to foreign current translation adjustment, loss on intra-equity foreign currency transaction	8	(36)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(403)	(23)
Other comprehensive income (loss) before reclassifications	33	152
Reclassification of (income) losses	0	9
Net other comprehensive income (loss)	33	161
Balance at end of period	(370)	138
Derivative Instrument Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	8	(10)
Other comprehensive income (loss) before reclassifications	(1)	(3)
Reclassification of (income) losses	(1)	4
Net other comprehensive income (loss)	(2)	1
Balance at end of period	6	(9)
Available-For-Sale Securities Unrealized Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period		4
Other comprehensive income (loss) before reclassifications		0
Reclassification of (income) losses		0
Net other comprehensive income (loss)		0
Balance at end of period		0
Pension and Postretirement Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	4	12
Other comprehensive income (loss) before reclassifications	0	0
Reclassification of (income) losses	0	0
Net other comprehensive income (loss)	0	0
Balance at end of period	4	12
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(391)	(17)
Net other comprehensive income (loss)	31	162
Balance at end of period	$ (360)	$ 141
Adoption of ASU 2016-01
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment of accounting principle			$ 0
Adoption of ASU 2016-01 | Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment of accounting principle			0
Adoption of ASU 2016-01 | Derivative Instrument Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment of accounting principle			0
Adoption of ASU 2016-01 | Available-For-Sale Securities Unrealized Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment of accounting principle			(4)
Adoption of ASU 2016-01 | Pension and Postretirement Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment of accounting principle			0
Adoption of ASU 2016-01 | Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment of accounting principle			$ (4)