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Accumulated Other Comprehensive Loss - Changes (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Jan. 01, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
AOCI roll forward
Beginning balance	$ 6,042			$ 6,042
Other comprehensive income (loss), net of tax		$ (21)	$ 33	(52)	$ 47
Ending balance		6,056		6,056
Accumulated Other Comprehensive Loss [Member]
AOCI roll forward
Beginning balance	8			8
Other comprehensive income (loss) before reclassifications, net of tax				(56)
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax				4
Other comprehensive income (loss), net of tax				(52)
Ending balance		(49)		(49)
Derivative Instruments [Member]
AOCI roll forward
Beginning balance	(33)			(33)
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax				4
Other comprehensive income (loss), net of tax				4
Ending balance		(36)		(36)
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		17
Foreign Currency Translation Adjustments [Member]
AOCI roll forward
Beginning balance	29			29
Other comprehensive income (loss) before reclassifications, net of tax				(55)
Other comprehensive income (loss), net of tax				(55)
Ending balance		(26)		(26)
Post - Retirement Benefit Obligation [Member]
AOCI roll forward
Beginning balance	(3)			(3)
Ending balance		$ (4)		(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)

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- Definition

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act of 2017.

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