Accumulated Other Comprehensive Loss - Changes (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) $ / $	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) $ / $	Sep. 30, 2019 USD ($)	Dec. 31, 2019 $ / $
AOCI roll forward
Beginning balance	$ 6,893	$ 6,467	$ 7,070	$ 6,276
Other comprehensive income (loss), net of tax	25	(11)	(8)	54
Ending balance	$ 7,157	6,787	$ 7,157	6,787
Dollar exchange rate | $ / $	0.7507		0.7507		0.7698
Accumulated Other Comprehensive Loss [Member]
AOCI roll forward
Beginning balance	$ (41)	(22)	$ (8)	(87)
Other comprehensive income (loss) before reclassifications, net of tax			(12)
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax			4
Other comprehensive income (loss), net of tax	25	(11)	(8)	54
Ending balance	(16)	$ (33)	(16)	$ (33)
Derivative Instruments [Member]
AOCI roll forward
Beginning balance			(24)
Other comprehensive income (loss) before reclassifications, net of tax			4
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax			5
Other comprehensive income (loss), net of tax			9
Ending balance	(15)		(15)
Available for sale Securities [Member]
AOCI roll forward
Beginning balance			38
Other comprehensive income (loss) before reclassifications, net of tax			7
Other comprehensive income (loss), net of tax			7
Ending balance	45		45
Foreign Currency Translation Adjustments [Member]
AOCI roll forward
Beginning balance			(21)
Other comprehensive income (loss) before reclassifications, net of tax			(23)
Other comprehensive income (loss), net of tax			(23)
Ending balance	(44)		(44)
Post - Retirement Benefit Obligation [Member]
AOCI roll forward
Beginning balance			(1)
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax			(1)
Other comprehensive income (loss), net of tax			(1)
Ending balance	$ (2)		$ (2)