Derivative Instruments - Asset and Liability Management Derivative Positions (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Derivative [Line Items]
Notional Value	$ 1,300,000
Other economic hedges | Equity contracts
Derivative [Line Items]
Notional Value	8	$ 0
Fair Value, Assets	0	0
Fair Value, Liabilities	0	0
Asset and Liability Management Positions
Derivative [Line Items]
Notional Value	107,542	105,692
Fair Value, Assets	298	275
Fair Value, Liabilities	191	221
Asset and Liability Management Positions | Swaps | Visa Class B Shares
Derivative [Line Items]
Fair Value, Liabilities	67	78
Derivative liability notional value	1,000	1,000
Asset and Liability Management Positions | Underwriting Purchase and Sale Commitments
Derivative [Line Items]
Notional Value	207
Asset and Liability Management Positions | Other
Derivative [Line Items]
Notional Value	1,290	1,084
Fair Value, Assets	7	7
Fair Value, Liabilities	67	78
Asset and Liability Management Positions | Other economic hedges | Interest rate contracts | Receive fixed/pay floating swaps
Derivative [Line Items]
Notional Value	10,443	9,977
Fair Value, Assets	78	45
Fair Value, Liabilities	30	23
Asset and Liability Management Positions | Other economic hedges | Interest rate contracts | Pay fixed/receive floating swaps
Derivative [Line Items]
Notional Value	2,818	2,371
Fair Value, Assets	0	0
Fair Value, Liabilities	0	0
Asset and Liability Management Positions | Other economic hedges | Interest rate contracts | Futures and forwards | Buy/ Purchased
Derivative [Line Items]
Notional Value	4,923	5,436
Fair Value, Assets	10	8
Fair Value, Liabilities	7	30
Asset and Liability Management Positions | Other economic hedges | Interest rate contracts | Futures and forwards | Sell/ Written
Derivative [Line Items]
Notional Value	2,745	2,711
Fair Value, Assets	1	10
Fair Value, Liabilities	9	1
Asset and Liability Management Positions | Other economic hedges | Interest rate contracts | Options | Buy/ Purchased
Derivative [Line Items]
Notional Value	6,724	7,810
Fair Value, Assets	176	186
Fair Value, Liabilities	0	0
Asset and Liability Management Positions | Other economic hedges | Interest rate contracts | Options | Sell/ Written
Derivative [Line Items]
Notional Value	2,672	1,991
Fair Value, Assets	17	8
Fair Value, Liabilities	54	47
Asset and Liability Management Positions | Other economic hedges | Foreign exchange forward contracts
Derivative [Line Items]
Notional Value	725	702
Fair Value, Assets	2	4
Fair Value, Liabilities	1	4
Asset and Liability Management Positions | Other economic hedges | Equity contracts
Derivative [Line Items]
Notional Value	288	293
Fair Value, Assets	0	0
Fair Value, Liabilities	6	9
Asset and Liability Management Positions | Other economic hedges | Credit contracts
Derivative [Line Items]
Notional Value	3,298	3,558
Fair Value, Assets	6	0
Fair Value, Liabilities	17	29
Asset and Liability Management Positions | Fair value hedges | Interest rate contracts | Receive fixed/pay floating swaps
Derivative [Line Items]
Notional Value	13,100	10,600
Fair Value, Assets	0	0
Fair Value, Liabilities	0	0
Asset and Liability Management Positions | Fair value hedges | Interest rate contracts | Pay fixed/receive floating swaps
Derivative [Line Items]
Notional Value	28,279	29,739
Fair Value, Assets	0	0
Fair Value, Liabilities	0	0
Asset and Liability Management Positions | Cash flow hedges | Interest rate contracts | Receive fixed/pay floating swaps
Derivative [Line Items]
Notional Value	28,500	28,550
Fair Value, Assets	0	0
Fair Value, Liabilities	0	0
Asset and Liability Management Positions | Cash flow hedges | Interest rate contracts | Pay fixed/receive floating swaps
Derivative [Line Items]
Notional Value	1,050	0
Fair Value, Assets	0	0
Fair Value, Liabilities	0	0
Asset and Liability Management Positions | Net investment hedges | Foreign exchange forward contracts
Derivative [Line Items]
Notional Value	687	870
Fair Value, Assets	1	7
Fair Value, Liabilities	$ 0	$ 0