Accumulated Other Comprehensive Loss - Changes (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) $ / $	Mar. 31, 2019 USD ($)	Dec. 31, 2019 $ / $
AOCI roll forward
Beginning balance	$ 7,070	$ 6,276
Other comprehensive income (loss), net of tax	(83)	34
Ending balance	$ 6,745	6,417
Dollar exchange rate | $ / $	0.7109		0.7698
Accumulated Other Comprehensive Loss [Member]
AOCI roll forward
Beginning balance	$ (8)	(87)
Other comprehensive income (loss) before reclassifications, net of tax	(85)
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax	2
Other comprehensive income (loss), net of tax	(83)	34
Ending balance	(91)	$ (53)
Derivative Instruments [Member]
AOCI roll forward
Beginning balance	(24)
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax	2
Other comprehensive income (loss), net of tax	2
Ending balance	(22)
Available for sale Securities [Member]
AOCI roll forward
Beginning balance	38
Other comprehensive income (loss) before reclassifications, net of tax	(9)
Other comprehensive income (loss), net of tax	(9)
Ending balance	29
Foreign Currency Translation Adjustments [Member]
AOCI roll forward
Beginning balance	(21)
Other comprehensive income (loss) before reclassifications, net of tax	(76)
Other comprehensive income (loss), net of tax	(76)
Ending balance	(97)
Post - Retirement Benefit Obligation [Member]
AOCI roll forward
Beginning balance	(1)
Ending balance	$ (1)