Equity (Components of 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 beginning of period	$ 5,421	$ 3,215	$ 718
OCI before reclassifications	(1,919)	3,126	3,273
Deferred income tax benefit (expense) (3)	402	(665)	(685)
AOCI before reclassifications, net of income tax	3,904	5,676	3,306
Amounts reclassified from AOCI	(5)	(323)	(115)
Deferred income tax benefit (expense) (3)	2	68	24
Amounts reclassified from AOCI, net of income tax	(3)	(255)	(91)
Balance end of period	3,901	5,421	3,215
Unrealized Investment Gains (Losses)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning of period	5,321	3,066	564
OCI before reclassifications	(2,090)	3,159	3,224
Deferred income tax benefit (expense) (3)	438	(663)	(677)
AOCI before reclassifications, net of income tax	3,669	5,562	3,111
Amounts reclassified from AOCI	7	(305)	(57)
Deferred income tax benefit (expense) (3)	(1)	64	12
Amounts reclassified from AOCI, net of income tax	6	(241)	(45)
Balance end of period	3,675	5,321	3,066
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning of period	108	163	180
OCI before reclassifications	170	(52)	37
Deferred income tax benefit (expense) (3)	(36)	11	(8)
AOCI before reclassifications, net of income tax	242	122	209
Amounts reclassified from AOCI	(12)	(18)	(58)
Deferred income tax benefit (expense) (3)	3	4	12
Amounts reclassified from AOCI, net of income tax	(9)	(14)	(46)
Balance end of period	233	108	163
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning of period	(8)	(14)	(26)
OCI before reclassifications	1	19	12
Deferred income tax benefit (expense) (3)	0	(13)	0
AOCI before reclassifications, net of income tax	(7)	(8)	(14)
Amounts reclassified from AOCI	0	0	0
Deferred income tax benefit (expense) (3)	0	0	0
Amounts reclassified from AOCI, net of income tax	0	0	0
Balance end of period	(7)	(8)	$ (14)
Cumulative effect of change in accounting principle, net of income tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning of period	$ 3
Balance end of period		$ 3