Investments Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) - USD ($) $ in Millions		Mar. 31, 2020		Dec. 31, 2019
Available-for-sale, Amortized Cost
Due in one year or less		$ 20,145
Due after one year through five years		50,674
Due after five years through ten years		65,012
Due after ten years		181,829
Amortized Cost		349,665		$ 346,574
Available-for-sale, Fair Value
Due in one year or less		20,478
Due after one year through five years		51,885
Due after five years through ten years		69,429
Due after ten years		215,577
Fair Value	[2]	389,714	[1]	391,096
Held-to-maturity, Amortized Cost
Due in one year or less		0
Due after one year through five years		114
Due after five years through ten years		588
Due after ten years		892
Amortized Cost	[2]	1,895	[1]	1,933
Held-to-maturity, Fair Value
Due in one year or less		0
Due after one year through five years		116
Due after five years through ten years		654
Due after ten years		1,155
Fair Value		2,249		2,302
Asset-backed securities
Available-for-sale, Amortized Cost
Debt Maturities, without single maturity date		13,859
Available-for-sale, Fair Value
Debt Maturities, without single maturity date		13,380
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		14,951
Available-for-sale, Fair Value
Debt Maturities, without single maturity date		15,572
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		3,195
Available-for-sale, Fair Value
Debt Maturities, without single maturity date		3,393
Held-to-maturity, Amortized Cost
Debt Maturities, without single maturity date		301
Held-to-maturity, Fair Value
Debt Maturities, without single maturity date		324
Prudential Netting Agreement | U.S. private corporate securities
Available-for-sale, Fair Value
Fair Value		5,616		4,751
Fixed maturities
Available-for-sale, Amortized Cost
Amortized Cost		349,665		346,574
Available-for-sale, Fair Value
Fair Value		389,714		391,096
Held-to-maturity, Amortized Cost
Amortized Cost		1,904		1,933
Held-to-maturity, Fair Value
Fair Value		2,249		2,302
Fixed maturities | U.S. private corporate securities
Available-for-sale, Amortized Cost
Amortized Cost		34,765		34,410
Available-for-sale, Fair Value
Fair Value		35,445		36,533
Fixed maturities | Asset-backed securities
Available-for-sale, Amortized Cost
Amortized Cost		13,859		13,067
Available-for-sale, Fair Value
Fair Value		13,380		13,174
Fixed maturities | Commercial mortgage-backed securities
Available-for-sale, Amortized Cost
Amortized Cost		14,951		14,978
Available-for-sale, Fair Value
Fair Value		15,572		15,574
Fixed maturities | Residential mortgage-backed securities
Available-for-sale, Amortized Cost
Amortized Cost		3,195		3,044
Available-for-sale, Fair Value
Fair Value		3,393		3,201
Held-to-maturity, Amortized Cost
Amortized Cost		301		310
Held-to-maturity, Fair Value
Fair Value		324		331
Fixed maturities | Prudential Netting Agreement
Held-to-maturity, Amortized Cost
Amortized Cost		4,998		4,998
Held-to-maturity, Fair Value
Fair Value		5,001		5,401
Fixed maturities | Prudential Netting Agreement | U.S. private corporate securities
Available-for-sale, Amortized Cost
Amortized Cost		5,616		4,751
Available-for-sale, Fair Value
Fair Value		$ 5,616		$ 4,757

[1] March 31, 2020 amounts include the impacts of the January 1, 2020 adoption of ASU 2016-13. See Note 2 for details.

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