Investments - Investments - Fixed Maturities, AFS, by Contractual Maturity Year (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Amortized Cost
One year or less	$ 1,269	$ 1,417
Over one year through five years	8,806	8,340
Over five years through ten years	7,427	7,259
Over ten years	9,364	9,532
Subtotal	26,866	26,548
Mortgage-backed and asset-backed securities	13,152	12,985
Fixed maturities, available-for-sale, at fair value, amortized cost	40,018	39,533
Fair Value
One year or less	1,248	1,396
Over one year through five years	8,461	7,930
Over five years through ten years	6,848	6,485
Over ten years	8,627	8,462
Subtotal	25,184	24,273
Mortgage-backed and asset-backed securities	12,260	11,958
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	$ 37,444	$ 36,231