Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year	$ (551)	$ (777)	$ (889)
Gains (losses) on foreign currency translation	(169)	179	18
Less: Tax provision/(benefit)	42	(47)	4
Net gains (losses) on foreign currency translation	(211)	226	14
Other comprehensive income (loss), net of tax	(211)	226	14
Balance at end of year	(762)	(551)	(777)
Balance at beginning of year	(44)	(68)	(36)
Gains (losses) deferred	209	(153)	23
Less: Tax provision/(benefit)	24	(33)	6
Net gains (losses) deferred	185	(120)	17
(Gains) losses reclassified to earnings	(166)	184	(62)
Less: Tax (provision)/benefit	(13)	40	(14)
Net (gains) losses reclassified to earnings	(153)	144	(48)
Other comprehensive income (loss), net of tax	32	24	(31)
Balance at end of year	(12)	(44)	(68)
Total Accumulated other comprehensive income (loss) at end of year	(774)	(595)	(845)
Adjustment to adopt new accounting guidance | Accounting Standards Update 2018-02
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year	0	0	98
Balance at end of year		0	0
Balance at beginning of year	0	0	(1)
Balance at end of year		0	0
Cumulative effect, period of adoption, adjusted balance
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year	(551)	(777)	(791)
Balance at end of year		(551)	(777)
Balance at beginning of year	$ (44)	(68)	(37)
Balance at end of year		$ (44)	$ (68)