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Investments - Consolidated Investments (Details) - USD ($) $ in Millions	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Available-for-sale securities
Total fixed maturity available-for-sale securities, Amortized Cost	$ 27,758		$ 25,577
Allowance for Expected Credit Losses	(13)	$ (7)	(19)
Gross Unrealized Gains	1,916		2,068
Gross Unrealized Losses	(150)		(39)
Fair Value/ Carrying Value	29,511		27,587
Asset-backed securities
Available-for-sale securities
Total fixed maturity available-for-sale securities, Amortized Cost	7,103		5,941
Allowance for Expected Credit Losses	(4)	0	0
Gross Unrealized Gains	323		343
Gross Unrealized Losses	(18)		(18)
Fair Value/ Carrying Value	7,404		6,266
Commercial mortgage-backed securities
Available-for-sale securities
Total fixed maturity available-for-sale securities, Amortized Cost	2,518		2,490
Allowance for Expected Credit Losses	(1)	(1)	0
Gross Unrealized Gains	432		342
Gross Unrealized Losses	(3)		(3)
Fair Value/ Carrying Value	2,946		2,829
Corporates
Available-for-sale securities
Total fixed maturity available-for-sale securities, Amortized Cost	13,865		13,582
Allowance for Expected Credit Losses	(5)	(3)	(16)
Gross Unrealized Gains	951		1,184
Gross Unrealized Losses	(119)		(15)
Fair Value/ Carrying Value	14,691		14,735
Hybrids
Available-for-sale securities
Total fixed maturity available-for-sale securities, Amortized Cost	879		914
Allowance for Expected Credit Losses	0		0
Gross Unrealized Gains	85		80
Gross Unrealized Losses	0		0
Fair Value/ Carrying Value	964		994
Municipals
Available-for-sale securities
Total fixed maturity available-for-sale securities, Amortized Cost	1,375		1,333
Allowance for Expected Credit Losses	0		0
Gross Unrealized Gains	80		72
Gross Unrealized Losses	(9)		(2)
Fair Value/ Carrying Value	1,446		1,403
Residential mortgage-backed securities
Available-for-sale securities
Total fixed maturity available-for-sale securities, Amortized Cost	773		806
Allowance for Expected Credit Losses	(3)	$ (3)	(3)
Gross Unrealized Gains	31		23
Gross Unrealized Losses	(1)		(1)
Fair Value/ Carrying Value	801		825
U.S. Government
Available-for-sale securities
Total fixed maturity available-for-sale securities, Amortized Cost	1,054		332
Allowance for Expected Credit Losses	0		0
Gross Unrealized Gains	5		10
Gross Unrealized Losses	0		0
Fair Value/ Carrying Value	1,059		342
Foreign Governments
Available-for-sale securities
Total fixed maturity available-for-sale securities, Amortized Cost	191		179
Allowance for Expected Credit Losses	0		0
Gross Unrealized Gains	9		14
Gross Unrealized Losses	0		0
Fair Value/ Carrying Value	$ 200		$ 193

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