Accumulated Other Comprehensive Loss - Changes (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
AOCI roll forward
Beginning balance		$ 7,454	$ 7,070	$ 6,276
Other comprehensive income (loss), net of tax		(22)	47	79
Ending balance		7,126	7,454	7,070
Accumulated Other Comprehensive Income (Loss) [Member]
AOCI roll forward
Beginning balance		39	(8)	(87)
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit		6	41	72
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit		(28)	6	7
Other comprehensive income (loss), net of tax		(22)	47	79
Ending balance		17	39	(8)
Derivative Instruments [Member]
AOCI roll forward
Beginning balance		(9)	(24)	(32)
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit			7
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit		9	8	8
Other comprehensive income (loss), net of tax		9	15	8
Ending balance			(9)	(24)
Available-for-Sale Debt Securities [Member]
AOCI roll forward
Beginning balance		49	38	23
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit		(6)	12	15
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit			(1)
Other comprehensive income (loss), net of tax		(6)	11	15
Ending balance		43	49	38
Foreign Currency Translation Adjustments [Member]
AOCI roll forward
Beginning balance		(1)	(21)	(76)
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit		7	20	55
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit	$ 35	(35)
Other comprehensive income (loss), net of tax		(28)	20	55
Ending balance		(29)	(1)	(21)
Post - Retirement Benefit Obligation [Member]
AOCI roll forward
Beginning balance			(1)	(2)
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit		5	2	2
Amounts reclassified from accumulated other comprehensive (income) loss, net of tax (expense) benefit		(2)	(1)	(1)
Other comprehensive income (loss), net of tax		3	$ 1	1
Ending balance		$ 3		$ (1)