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Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) - USD ($) $ in Millions		Mar. 31, 2021	Dec. 31, 2020
Available-for-sale, Amortized Cost
Due in one year or less		$ 16,008
Due after one year through five years		52,751
Due after five years through ten years		64,596
Due after ten years		176,683
Amortized Cost		341,122	$ 354,470
Available-for-sale, Fair Value
Due in one year or less		16,547
Due after one year through five years		56,779
Due after five years through ten years		71,466
Due after ten years		201,651
Fair Value	[1]	378,596	412,905
Held-to-maturity, Amortized Cost
Due in one year or less		112
Due after one year through five years		496
Due after five years through ten years		105
Due after ten years		846
Amortized Cost	[1]	1,801	1,930
Held-to-maturity, Fair Value
Due in one year or less		112
Due after one year through five years		564
Due after five years through ten years		108
Due after ten years		1,082
Fair Value		2,125	2,298
Asset-backed securities
Available-for-sale, Amortized Cost
Debt Maturities, without single maturity date		13,470
Available-for-sale, Fair Value
Debt Maturities, without single maturity date		13,635
Held-to-maturity, Amortized Cost
Debt Maturities, without single maturity date		0
Held-to-maturity, Fair Value
Debt Maturities, without single maturity date		0
Commercial mortgage-backed securities
Available-for-sale, Amortized Cost
Debt Maturities, without single maturity date		14,673
Available-for-sale, Fair Value
Debt Maturities, without single maturity date		15,425
Held-to-maturity, Amortized Cost
Debt Maturities, without single maturity date		0
Held-to-maturity, Fair Value
Debt Maturities, without single maturity date		0
Residential mortgage-backed securities
Available-for-sale, Amortized Cost
Debt Maturities, without single maturity date		2,941
Available-for-sale, Fair Value
Debt Maturities, without single maturity date		3,093
Held-to-maturity, Amortized Cost
Debt Maturities, without single maturity date		242
Held-to-maturity, Fair Value
Debt Maturities, without single maturity date		259
Fixed maturities
Available-for-sale, Amortized Cost
Amortized Cost		341,122	354,470
Available-for-sale, Fair Value
Fair Value		378,596	412,905
Held-to-maturity, Amortized Cost
Amortized Cost		1,808	1,939
Held-to-maturity, Fair Value
Fair Value		2,125	2,298
Fixed maturities | U.S. private corporate securities
Available-for-sale, Amortized Cost
Amortized Cost		36,904	36,894
Available-for-sale, Fair Value
Fair Value		39,348	40,937
Fixed maturities | Asset-backed securities
Available-for-sale, Amortized Cost
Amortized Cost		13,470	14,489
Available-for-sale, Fair Value
Fair Value		13,635	14,591
Fixed maturities | Commercial mortgage-backed securities
Available-for-sale, Amortized Cost
Amortized Cost		14,673	15,036
Available-for-sale, Fair Value
Fair Value		15,425	16,303
Fixed maturities | Residential mortgage-backed securities
Available-for-sale, Amortized Cost
Amortized Cost		2,941	2,683
Available-for-sale, Fair Value
Fair Value		3,093	2,887
Held-to-maturity, Amortized Cost
Amortized Cost		242	266
Held-to-maturity, Fair Value
Fair Value		259	286
Fixed maturities | Prudential Netting Agreement
Held-to-maturity, Amortized Cost
Amortized Cost		4,748	4,998
Held-to-maturity, Fair Value
Fair Value		5,186	5,821
Fixed maturities | Prudential Netting Agreement | U.S. private corporate securities
Available-for-sale, Amortized Cost
Amortized Cost		5,766	5,966
Available-for-sale, Fair Value
Fair Value		$ 5,774	$ 6,100
[1] See Note 4 for details of balances associated with variable interest entities.

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