Derivatives and Hedge Accounting - Notional Amounts and Fair Values of Derivative Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Gross Derivative Assets
Notional Amount	$ 6,417	$ 59,589
Fair Value	619	1,292
Counterparty netting	(276)	(450)
Cash Collateral	(241)	(711)
Total derivative assets	102	131
Gross Derivative Liabilities
Notional Amount	7,079	10,973
Fair Value	654	952
Counterparty netting	(276)	(450)
Cash Collateral	(209)	(249)
Total derivative liabilities on consolidated balance sheet	169	253
Bifurcated embedded derivatives assets, fair value	3,400	3,400
Bifurcated embedded derivative liabilities, fair value	0	0
Derivatives designated as hedging instruments | Foreign exchange contracts
Gross Derivative Assets
Notional Amount	460	933
Fair Value	56	58
Gross Derivative Liabilities
Notional Amount	1,045	1,296
Fair Value	106	164
Derivatives not designated as hedging instruments | Interest rate contracts
Gross Derivative Assets
Notional Amount	905	14,657
Fair Value	305	741
Gross Derivative Liabilities
Notional Amount	982	1,165
Fair Value	333	352
Derivatives not designated as hedging instruments | Foreign exchange contracts
Gross Derivative Assets
Notional Amount	2,820	4,019
Fair Value	193	393
Gross Derivative Liabilities
Notional Amount	2,659	8,008
Fair Value	149	400
Derivatives not designated as hedging instruments | Equity contracts
Gross Derivative Assets
Notional Amount	45	36,045
Fair Value	31	66
Gross Derivative Liabilities
Notional Amount	45	0
Fair Value	31	0
Derivatives not designated as hedging instruments | Credit contracts
Gross Derivative Assets
Notional Amount	57	1,804
Fair Value	33	33
Gross Derivative Liabilities
Notional Amount	218	504
Fair Value	34	36
Derivatives not designated as hedging instruments | Credit contracts | CDS
Gross Derivative Liabilities
Notional Amount	53	50
Fair Value	33	32
Derivatives not designated as hedging instruments | Other contracts
Gross Derivative Assets
Notional Amount	2,130	2,131
Fair Value	1	1
Gross Derivative Liabilities
Notional Amount	2,130	0
Fair Value	$ 1	$ 0