AOCI Rollforward (Details 2) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Components of AOCI
Beginning balance		$ 5,502	$ 6,693	$ 5,867	$ 5,729
Total other comprehensive income (loss), net of tax		143	689	(169)	132
Ending balance		5,686	6,500	5,686	6,500
Accumulated Other  Comprehensive Income (Loss)
Components of AOCI
Beginning balance		317	(295)	629	262
Arising during the period		144	692	(129)	129
Amounts reclassified from AOCI		(1)	(3)	(40)	3
Total other comprehensive income (loss), net of tax		143	689	(169)	132
Ending balance		460	394	460	394
Net Unrealized Gains (Losses) on Securities
Components of AOCI
Beginning balance		643	52	983	576
Arising during the period		142	700	(159)	170
Amounts reclassified from AOCI	[1]	(1)	(3)	(40)	3
Total other comprehensive income (loss), net of tax		141	697	(199)	173
Ending balance		784	749	784	749
Net Unrealized Gains (Losses) on Derivatives
Components of AOCI
Beginning balance		5	6	5	6
Total other comprehensive income (loss), net of tax		0	0	0	0
Ending balance		5	6	5	6
Defined Benefit Plans
Components of AOCI
Beginning balance		(175)	(138)	(204)	(138)
Arising during the period				29
Total other comprehensive income (loss), net of tax		0	0	29	0
Ending balance		(175)	(138)	(175)	(138)
Foreign Currency Translation
Components of AOCI
Beginning balance		(155)	(214)	(154)	(181)
Arising during the period		2	(8)	1	(41)
Total other comprehensive income (loss), net of tax		2	(8)	1	(41)
Ending balance		(153)	(222)	(153)	(222)
Other
Components of AOCI
Beginning balance		(1)	(1)	(1)	(1)
Total other comprehensive income (loss), net of tax		0	0	0	0
Ending balance		$ (1)	$ (1)	$ (1)	$ (1)

[1] Reclassification amounts are recorded in net investment income.