Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020
Available-for-sale, Amortized Cost
Due in one year or less		$ 12,858
Due after one year through five years		53,062
Due after five years through ten years		66,502
Due after ten years		176,377
Amortized Cost		338,942	$ 354,470
Available-for-sale, Fair Value
Due in one year or less		13,332
Due after one year through five years		57,163
Due after five years through ten years		74,127
Due after ten years		207,031
Fair Value	[1]	382,981	412,905
Held-to-maturity, Amortized Cost
Due in one year or less		0
Due after one year through five years		495
Due after five years through ten years		104
Due after ten years		842
Amortized Cost	[1]	1,662	1,930
Held-to-maturity, Fair Value
Due in one year or less		0
Due after one year through five years		560
Due after five years through ten years		108
Due after ten years		1,080
Fair Value		1,987	2,298
Asset-backed securities
Available-for-sale, Amortized Cost
Debt Maturities, without single maturity date		13,463
Available-for-sale, Fair Value
Debt Maturities, without single maturity date		13,613
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		13,764
Available-for-sale, Fair Value
Debt Maturities, without single maturity date		14,647
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		2,916
Available-for-sale, Fair Value
Debt Maturities, without single maturity date		3,068
Held-to-maturity, Amortized Cost
Debt Maturities, without single maturity date		221
Held-to-maturity, Fair Value
Debt Maturities, without single maturity date		239
Fixed maturities
Available-for-sale, Amortized Cost
Amortized Cost		338,942	354,470
Available-for-sale, Fair Value
Fair Value		382,981	412,905
Held-to-maturity, Amortized Cost
Amortized Cost		1,669	1,939
Held-to-maturity, Fair Value
Fair Value		1,987	2,298
Fixed maturities | U.S. private corporate securities
Available-for-sale, Amortized Cost
Amortized Cost		36,968	36,894
Available-for-sale, Fair Value
Fair Value		40,100	40,937
Fixed maturities | Asset-backed securities
Available-for-sale, Amortized Cost
Amortized Cost		13,463	14,489
Available-for-sale, Fair Value
Fair Value		13,613	14,591
Fixed maturities | Commercial mortgage-backed securities
Available-for-sale, Amortized Cost
Amortized Cost		13,764	15,036
Available-for-sale, Fair Value
Fair Value		14,647	16,303
Fixed maturities | Residential mortgage-backed securities
Available-for-sale, Amortized Cost
Amortized Cost		2,916	2,683
Available-for-sale, Fair Value
Fair Value		3,068	2,887
Held-to-maturity, Amortized Cost
Amortized Cost		221	266
Held-to-maturity, Fair Value
Fair Value		239	286
Fixed maturities | Prudential Netting Agreement
Held-to-maturity, Amortized Cost
Amortized Cost		4,748	4,998
Held-to-maturity, Fair Value
Fair Value		5,427	5,821
Fixed maturities | Prudential Netting Agreement | U.S. private corporate securities
Available-for-sale, Amortized Cost
Amortized Cost		5,616	5,966
Available-for-sale, Fair Value
Fair Value		$ 5,674	$ 6,100

[1] See Note 4 for details of balances associated with variable interest entities.