Derivatives and Hedge Accounting - Notional Amounts and Fair Values of Derivative Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Gross Derivative Assets
Notional Amount	$ 8,839	$ 59,589
Fair Value	592	1,292
Counterparty netting	(245)	(450)
Cash Collateral	(288)	(711)
Total derivative assets	59	131
Gross Derivative Liabilities
Notional Amount	4,441	10,973
Fair Value	649	952
Counterparty netting	(245)	(450)
Cash Collateral	(180)	(249)
Total derivative liabilities on consolidated balance sheet	224	253
Bifurcated embedded derivatives assets, fair value	154	3,400
Bifurcated embedded derivative liabilities, fair value	0	0
Derivatives designated as hedging instruments | Foreign exchange contracts
Gross Derivative Assets
Notional Amount	625	933
Fair Value	42	58
Gross Derivative Liabilities
Notional Amount	947	1,296
Fair Value	157	164
Derivatives not designated as hedging instruments | Interest rate contracts
Gross Derivative Assets
Notional Amount	1,799	14,657
Fair Value	266	741
Gross Derivative Liabilities
Notional Amount	937	1,165
Fair Value	291	352
Derivatives not designated as hedging instruments | Foreign exchange contracts
Gross Derivative Assets
Notional Amount	2,408	4,019
Fair Value	215	393
Gross Derivative Liabilities
Notional Amount	2,350	8,008
Fair Value	168	400
Derivatives not designated as hedging instruments | Equity contracts
Gross Derivative Assets
Notional Amount	81	36,045
Fair Value	35	66
Gross Derivative Liabilities
Notional Amount	0	0
Fair Value	0	0
Derivatives not designated as hedging instruments | Credit contracts
Gross Derivative Assets
Notional Amount	1,803	1,804
Fair Value	33	33
Gross Derivative Liabilities
Notional Amount	207	504
Fair Value	33	36
Derivatives not designated as hedging instruments | Credit contracts | CDS
Gross Derivative Liabilities
Notional Amount	48	50
Fair Value	32	32
Derivatives not designated as hedging instruments | Other contracts
Gross Derivative Assets
Notional Amount	2,123	2,131
Fair Value	1	1
Gross Derivative Liabilities
Notional Amount	0	0
Fair Value	$ 0	$ 0