Investments - Amortized cost and fair value of fixed maturity securities available for sale by contractual maturity (Details) - USD ($) $ in Millions		Jun. 30, 2023	Dec. 31, 2022
Amortized Cost, Net of Allowance
Due in one year or less		$ 9,123
Due after one year through five years		45,775
Due after five years through ten years		41,559
Due after ten years		89,652
Mortgage-backed, asset-backed and collateralized		63,001
Total		249,110
Fair Value
Due in one year or less		9,000
Due after one year through five years		43,487
Due after five years through ten years		37,535
Due after ten years		73,104
Mortgage-backed, asset-backed and collateralized		59,404
Total	[1]	$ 222,530	$ 226,156

[1] See Note 10 for details of balances associated with variable interest entities.