Equity (Balance of and Changes in Each Component of AOCI) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance, beginning of year		$ 3,642	$ 5,359	$ 3,137
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax		(12,158)	(2,039)	2,859
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		444	(168)	(36)
Other Comprehensive Income (Loss), Tax		2,467	490	(601)
Balance, end of year		(5,605)	3,642	5,359
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance, beginning of year		(9)	(69)	(92)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax		(141)	83	14
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		0	0	0
Other Comprehensive Income (Loss), Tax		(21)	(23)	9
Balance, end of year		(171)	(9)	(69)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance, beginning of year	[1]	3,701	5,500	3,299
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	[1]	(12,045)	(2,144)	2,854
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[1]	(442)	175	42
Other Comprehensive Income (Loss), Tax	[1]	2,495	520	(611)
Balance, end of year	[1]	(5,407)	3,701	5,500
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance, beginning of year		(50)	(72)	(70)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax		28	22	(9)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(2)	(7)	(6)
Other Comprehensive Income (Loss), Tax		(7)	(7)	1
Balance, end of year		(27)	(50)	(72)
Accounting Standards Update 2018-02 [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Stockholders' Equity, Other		$ 0	$ 0	$ (12)

[1] Includes cash flow hedges of $(205), $(22) and $(49) as of December 31, 2022, 2021 and 2020, respectively. See Note 5 for additional information on cash flow hedges.