Derivative Instruments and Hedging Activities - Schedule of Fair Value Amounts of Derivative Instruments Reported on our Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Derivatives, Fair Value [Line Items]
receivable position	$ 2	$ 12
payable position	4	4
Notional amount	42,011	40,508
Credit derivative, maximum exposure, undiscounted	7	10
Total derivatives designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	2	10
payable position	0	0
Notional amount	41,328	39,620
Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	2
payable position	4	4
Notional amount	683	888
Interest rate contracts | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	1
payable position	0	0
Notional amount	41	172
Swaps | Total derivatives designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	0
payable position	0	0
Notional amount	35,007	33,300
Purchased options | Total derivatives designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	2	2
payable position	0	0
Notional amount	6,150	6,150
Forwards | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	0
payable position	0	0
Notional amount	34	109
Written options | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	1
payable position	0	0
Notional amount	7	63
Foreign exchange contracts | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	1
payable position	0	0
Notional amount	43	47
Forwards | Total derivatives designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	8
payable position	0	0
Notional amount	171	170
Forwards | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	1
payable position	0	0
Notional amount	43	47
Total credit risk | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	0
payable position	4	4
Notional amount	599	669
Credit-linked note derivatives | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	0
payable position	0	0
Notional amount	599	669
Other credit derivatives | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	0
payable position	$ 4	$ 4