Accumulated Other Comprehensive Income (Loss) - Changes (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
AOCI roll forward
Beginning balance	$ 7,146	$ 7,429	$ 7,126	$ 7,454
Other comprehensive income (loss), net of tax	(32)	22	(34)	31
Ending balance	7,192	7,354	7,192	7,354
Accumulated Other Comprehensive Income (Loss) [Member]
AOCI roll forward
Beginning balance	15	48	17	39
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit			(20)
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit			(14)
Other comprehensive income (loss), net of tax	(32)	22	(34)	31
Ending balance	(17)	$ 70	(17)	$ 70
Derivative Instruments [Member]
AOCI roll forward
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit			3
Other comprehensive income (loss), net of tax			3
Ending balance	3		3
Available-for-Sale Debt Securities [Member]
AOCI roll forward
Beginning balance			43
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit			(20)
Other comprehensive income (loss), net of tax			(20)
Ending balance	23		23
Foreign Currency Translation Adjustments [Member]
AOCI roll forward
Beginning balance			(29)
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit			(17)
Other comprehensive income (loss), net of tax			(17)
Ending balance	(46)		(46)
Post - Retirement Benefit Obligation [Member]
AOCI roll forward
Beginning balance			3
Ending balance	$ 3		$ 3