Derivatives and Hedge Accounting - Notional Amounts and Fair Values of Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Gross Derivative Assets
Notional Amount	$ 4,896	$ 59,589
Fair Value	624	1,292
Counterparty netting	(270)	(450)
Cash Collateral	(304)	(711)
Total derivative assets	50	131
Gross Derivative Liabilities
Notional Amount	3,702	10,973
Fair Value	622	952
Counterparty netting	(270)	(450)
Cash Collateral	(201)	(249)
Total derivative liabilities on consolidated balance sheet	151	253
Bifurcated embedded derivatives assets, fair value	3,200	3,400
Bifurcated embedded derivative liabilities, fair value	0	0
Derivatives designated as hedging instruments | Foreign exchange contracts
Gross Derivative Assets
Notional Amount	879	933
Fair Value	66	58
Gross Derivative Liabilities
Notional Amount	906	1,296
Fair Value	109	164
Derivatives not designated as hedging instruments | Interest rate contracts
Gross Derivative Assets
Notional Amount	841	14,657
Fair Value	277	741
Gross Derivative Liabilities
Notional Amount	913	1,165
Fair Value	304	352
Derivatives not designated as hedging instruments | Foreign exchange contracts
Gross Derivative Assets
Notional Amount	3,095	4,019
Fair Value	230	393
Gross Derivative Liabilities
Notional Amount	1,707	8,008
Fair Value	158	400
Derivatives not designated as hedging instruments | Equity contracts
Gross Derivative Assets
Notional Amount	29	36,045
Fair Value	20	66
Gross Derivative Liabilities
Notional Amount	29	0
Fair Value	20	0
Derivatives not designated as hedging instruments | Credit contracts
Gross Derivative Assets
Notional Amount	52	1,804
Fair Value	31	33
Gross Derivative Liabilities
Notional Amount	147	504
Fair Value	31	36
Derivatives not designated as hedging instruments | Credit contracts | CDS
Gross Derivative Liabilities
Notional Amount	48	50
Fair Value	30	32
Derivatives not designated as hedging instruments | Other contracts
Gross Derivative Assets
Notional Amount	0	2,131
Fair Value	0	1
Gross Derivative Liabilities
Notional Amount	0	0
Fair Value	$ 0	$ 0