Equity (Components of Net Unrealized Appreciation Depreciation of Balances Carried at Fair Value) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Comprehensive Income Net Of Tax [Line Items]
Fixed maturity securities available-for-sale		$ (56,735)	$ (51,121)
Other invested assets		(2,829)	(2,363)
Deferred policy acquisition costs		3,616	3,512	$ 3,398	$ 3,240
Accumulated Other Comprehensive Income Loss Change In Component During Period		2,812	3,123	(1,712)
Change In Net Unrealized Appreciation Depreciation [Member]
Comprehensive Income Net Of Tax [Line Items]
Fixed maturity securities available-for-sale		(2,837)	(3,258)	(1,759)
Other invested assets	[1]	(29)	(37)	(20)
Effect On Unrealized Appreciation Depreciation [Member]
Comprehensive Income Net Of Tax [Line Items]
Deferred policy acquisition costs		$ 54	$ 98	$ 27

[1] Includes cash flow hedges. See Note 5 for additional information on cash flow hedges.