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Investments - Consolidated Investments (Details) - USD ($) $ in Millions	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Available-for-sale securities
Total fixed maturity available-for-sale securities, Amortized Cost	$ 28,837		$ 25,577
Allowance for Expected Credit Losses	(8)	$ (13)	(19)
Gross Unrealized Gains	1,797		2,068
Gross Unrealized Losses	(191)		(39)
Fair Value/ Carrying Value	30,435		27,587
Asset-backed securities
Available-for-sale securities
Total fixed maturity available-for-sale securities, Amortized Cost	7,916		5,941
Allowance for Expected Credit Losses	(3)	(4)	0
Gross Unrealized Gains	293		343
Gross Unrealized Losses	(15)		(18)
Fair Value/ Carrying Value	8,191		6,266
Commercial mortgage-backed securities
Available-for-sale securities
Total fixed maturity available-for-sale securities, Amortized Cost	2,619		2,490
Allowance for Expected Credit Losses	(1)	(1)	0
Gross Unrealized Gains	411		342
Gross Unrealized Losses	(5)		(3)
Fair Value/ Carrying Value	3,024		2,829
Corporates
Available-for-sale securities
Total fixed maturity available-for-sale securities, Amortized Cost	14,441		13,582
Allowance for Expected Credit Losses	0	(5)	(16)
Gross Unrealized Gains	887		1,184
Gross Unrealized Losses	(151)		(15)
Fair Value/ Carrying Value	15,177		14,735
Hybrids
Available-for-sale securities
Total fixed maturity available-for-sale securities, Amortized Cost	834		914
Allowance for Expected Credit Losses	0		0
Gross Unrealized Gains	89		80
Gross Unrealized Losses	0		0
Fair Value/ Carrying Value	923		994
Municipals
Available-for-sale securities
Total fixed maturity available-for-sale securities, Amortized Cost	1,306		1,333
Allowance for Expected Credit Losses	0		0
Gross Unrealized Gains	71		72
Gross Unrealized Losses	(9)		(2)
Fair Value/ Carrying Value	1,368		1,403
Residential mortgage-backed securities
Available-for-sale securities
Total fixed maturity available-for-sale securities, Amortized Cost	714		806
Allowance for Expected Credit Losses	(4)	$ (3)	(3)
Gross Unrealized Gains	33		23
Gross Unrealized Losses	(2)		(1)
Fair Value/ Carrying Value	741		825
U.S. Government
Available-for-sale securities
Total fixed maturity available-for-sale securities, Amortized Cost	808		332
Allowance for Expected Credit Losses	0		0
Gross Unrealized Gains	5		10
Gross Unrealized Losses	(8)		0
Fair Value/ Carrying Value	805		342
Foreign Governments
Available-for-sale securities
Total fixed maturity available-for-sale securities, Amortized Cost	199		179
Allowance for Expected Credit Losses	0		0
Gross Unrealized Gains	8		14
Gross Unrealized Losses	(1)		0
Fair Value/ Carrying Value	$ 206		$ 193

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