Equity (Balance of and Changes in Each Component of AOCI) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance, beginning of year		$ 5,359	$ 3,137	$ 636
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax		(2,039)	2,859	3,358
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(168)	(36)	(178)
Other Comprehensive Income (Loss), Tax		490	(601)	(679)
Balance, end of year		3,642	5,359	3,137
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance, beginning of year		(69)	(92)	(169)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax		83	14	80
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		0	0	0
Other Comprehensive Income (Loss), Tax		(23)	9	(3)
Balance, end of year		(9)	(69)	(92)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance, beginning of year	[1]	5,500	3,299	856
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	[1]	(2,144)	2,854	3,306
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[1]	175	42	182
Other Comprehensive Income (Loss), Tax	[1]	520	(611)	(681)
Balance, end of year	[1]	3,701	5,500	3,299
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance, beginning of year		(72)	(70)	(51)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax		22	(9)	(28)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(7)	(6)	(4)
Other Comprehensive Income (Loss), Tax		(7)	1	5
Balance, end of year		(50)	(72)	(70)
Accounting Standards Update 2018-02 [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Stockholders' Equity, Other		$ 0	$ (12)	$ 0

[1] Includes cash flow hedges of $(22), $(49) and $(26) as of December 31, 2021, 2020 and 2019, respectively. See Note 5 for additional information on cash flow hedges.