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Investments, Net Investment Income (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net Investment Income [Abstract]
Investment income		$ 634	$ 662	$ 1,204	$ 846
Investment expenses		(18)	(18)	(38)	(39)
Net investment income		616	644	1,166	807
Net unrealized gains (losses) on securities		28	80	58	7
Fixed Maturity Securities [Member]
Net Investment Income [Abstract]
Investment income		425	430	853	868
Limited Partnership Investments [Member]
Net Investment Income [Abstract]
Investment income		149	57	196	(45)
Short Term Investments [Member]
Net Investment Income [Abstract]
Investment income			2		9
Equity Securities [Member]
Net Investment Income [Abstract]
Investment income				49	6
Investment income		20	50
Income (Loss) from Trading Portfolio [Member]
Net Investment Income [Abstract]
Investment income	[1]	26	107	76	(22)
Other [Member]
Net Investment Income [Abstract]
Investment income		$ 14	$ 16	$ 30	$ 30
[1] Net unrealized gains (losses) related to changes in fair value on securities still held were $28 and $80 for the three months ended June 30, 2021 and 2020 and $58 and $7 for the six months ended June 30, 2021 and 2020.

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Amount of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

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