Accumulated Other Comprehensive Loss - Changes (Detail) - USD ($) $ in Millions		3 Months Ended
	Jan. 01, 2018	Mar. 31, 2018	Mar. 31, 2017
AOCI roll forward
Beginning balance	$ 6,042	$ 6,042
Other comprehensive income (loss), net of tax		(31)	$ 14
Ending balance		6,065
Accumulated Other Comprehensive Loss [Member]
AOCI roll forward
Beginning balance	8	8
Other comprehensive income (loss) before reclassifications, net of tax		(33)
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax		2
Other comprehensive income (loss), net of tax		(31)
Ending balance		(28)
Derivative Instruments [Member]
AOCI roll forward
Beginning balance	(33)	(33)
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax		2
Other comprehensive income (loss), net of tax		2
Ending balance		(38)
Available for sale Securities [Member]
AOCI roll forward
Beginning balance	15	15
Other comprehensive income (loss) before reclassifications, net of tax		(1)
Other comprehensive income (loss), net of tax		(1)
Ending balance		17
Foreign Currency Translation Adjustments [Member]
AOCI roll forward
Beginning balance	29	29
Other comprehensive income (loss) before reclassifications, net of tax		(32)
Other comprehensive income (loss), net of tax		(32)
Ending balance		(3)
Post - Retirement Benefit Obligation [Member]
AOCI roll forward
Beginning balance	(3)	(3)
Ending balance		(4)
Accounting Standards Update 2018-02 [Member]
AOCI roll forward
Adoption of new accounting standard	$ (5)
Accounting Standards Update 2018-02 [Member] | Accumulated Other Comprehensive Loss [Member]
AOCI roll forward
Adoption of new accounting standard		(5)
Accounting Standards Update 2018-02 [Member] | Derivative Instruments [Member]
AOCI roll forward
Adoption of new accounting standard		(7)
Accounting Standards Update 2018-02 [Member] | Available for sale Securities [Member]
AOCI roll forward
Adoption of new accounting standard		3
Accounting Standards Update 2018-02 [Member] | Post - Retirement Benefit Obligation [Member]
AOCI roll forward
Adoption of new accounting standard		$ (1)