Other Comprehensive (Loss) Income and Shareholders' Equity - Accumulated Other Comprehensive (Loss) Income Activity (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	$ 3,731
Other comprehensive income (loss) before reclassifications	149	$ 185
Amounts reclassified from accumulated other comprehensive income (loss)	13	0
Net other comprehensive income (loss)	162	185
Balance at end of period	3,566
Other comprehensive income (loss) before reclassification related to foreign current translation adjustment, loss on intra-equity foreign currency transaction	36	16
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(23)	(503)
Other comprehensive income (loss) before reclassifications	152	188
Amounts reclassified from accumulated other comprehensive income (loss)	9	0
Net other comprehensive income (loss)	161	188
Balance at end of period	138	(315)
Derivative Instrument Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(10)	(5)
Other comprehensive income (loss) before reclassifications	(3)	(2)
Amounts reclassified from accumulated other comprehensive income (loss)	4	0
Net other comprehensive income (loss)	1	(2)
Balance at end of period	(9)	(7)
Available-For-Sale Securities Unrealized Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	4	6
Other comprehensive income (loss) before reclassifications	0	(1)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Net other comprehensive income (loss)	0	(1)
Balance at end of period	0	5
Pension and Postretirement Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	12	5
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Net other comprehensive income (loss)	0	0
Balance at end of period	12	5
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(17)	(497)
Net other comprehensive income (loss)	162
Balance at end of period	$ 141	$ (312)
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 Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment of accounting principle			$ (4)