Derivative Instruments and Hedging Activities - Schedule of Fair Value Amounts of Derivative Instruments Reported on our Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
receivable position	$ 8	$ 33
payable position	7	17
Notional amount	38,490	44,468
Credit derivative, maximum exposure, undiscounted	17	29
Total derivatives designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	5	31
payable position	1	6
Notional amount	36,861	42,251
Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	3	2
payable position	6	11
Notional amount	1,629	2,217
Interest rate contracts | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	3	2
payable position	0	0
Notional amount	1,251	2,158
Swaps | Total derivatives designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	0
payable position	0	0
Notional amount	30,450	35,835
Swaps | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	0
payable position	0	0
Notional amount	1,000	2,000
Purchased options | Total derivatives designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	5	31
payable position	0	0
Notional amount	6,250	6,250
Forwards | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	1	0
payable position	0	0
Notional amount	116	70
Written options | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	2	2
payable position	0	0
Notional amount	135	88
Foreign exchange contracts | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	0
payable position	0	1
Notional amount	48	59
Forwards | Total derivatives designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	0
payable position	1	6
Notional amount	161	166
Forwards | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	0
payable position	0	1
Notional amount	48	59
Total credit risk | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	0
payable position	5	10
Notional amount	330	0
Credit-linked note derivative | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	0
payable position	0	0
Notional amount	330	0
Other credit derivatives | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	0
payable position	5	10
Equity contracts | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	0
payable position	1	0
Notional amount	0	0
Written options | Total derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
receivable position	0	0
payable position	1	0
Notional amount	$ 0	$ 0