Other Comprehensive (Loss) Income and Shareholders' Equity - Accumulated Other Comprehensive (Loss) Income Activity (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			$ 5,357
Other comprehensive income (loss) before reclassifications			443	$ 24
Amounts reclassified from accumulated other comprehensive loss			5	3
Net other comprehensive income (loss)	$ 107	$ 4	448	27
Balance at end of period	4,512		4,512
Other comprehensive income (loss) before reclassification related to foreign current translation adjustment, loss on intra-equity foreign currency transaction			142	1
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			(503)	(192)
Other comprehensive income (loss) before reclassifications			457	27
Amounts reclassified from accumulated other comprehensive loss			0	0
Net other comprehensive income (loss)			457	27
Balance at end of period	(46)	(165)	(46)	(165)
Derivative Instrument Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			(5)	(8)
Other comprehensive income (loss) before reclassifications			(13)	(3)
Amounts reclassified from accumulated other comprehensive loss			5	3
Net other comprehensive income (loss)			(8)	0
Balance at end of period	(13)	(8)	(13)	(8)
Available-For-Sale Securities Unrealized Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			6	4
Other comprehensive income (loss) before reclassifications			(1)	0
Amounts reclassified from accumulated other comprehensive loss			0	0
Net other comprehensive income (loss)			(1)	0
Balance at end of period	5	4	5	4
Pension and Postretirement Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			5	0
Other comprehensive income (loss) before reclassifications			0	0
Amounts reclassified from accumulated other comprehensive loss			0	0
Net other comprehensive income (loss)			0	0
Balance at end of period	5	0	5	0
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			(497)	(196)
Net other comprehensive income (loss)			448
Balance at end of period	$ (49)	$ (169)	$ (49)	$ (169)