Derivative Instruments - Asset and Liability Management Derivative Positions (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Derivative [Line Items]
Notional Value	$ 1,400,000
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	117,038	105,692
Fair Value, Assets	362	275
Fair Value, Liabilities	279	221
Asset and Liability Management Positions | Swaps | Visa Class B Shares
Derivative [Line Items]
Fair Value, Liabilities	119	78
Derivative liability notional value	1,000	1,000
Asset and Liability Management Positions | Underwriting Purchase and Sale Commitments
Derivative [Line Items]
Notional Value	1,000
Asset and Liability Management Positions | Other
Derivative [Line Items]
Notional Value	2,094	1,084
Fair Value, Assets	11	7
Fair Value, Liabilities	124	78
Asset and Liability Management Positions | Other economic hedges | Interest rate contracts | Receive fixed/pay floating swaps
Derivative [Line Items]
Notional Value	14,505	9,977
Fair Value, Assets	126	45
Fair Value, Liabilities	28	23
Asset and Liability Management Positions | Other economic hedges | Interest rate contracts | Pay fixed/receive floating swaps
Derivative [Line Items]
Notional Value	5,968	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	6,078	5,436
Fair Value, Assets	24	8
Fair Value, Liabilities	5	30
Asset and Liability Management Positions | Other economic hedges | Interest rate contracts | Futures and forwards | Sell/ Written
Derivative [Line Items]
Notional Value	3,650	2,711
Fair Value, Assets	8	10
Fair Value, Liabilities	26	1
Asset and Liability Management Positions | Other economic hedges | Interest rate contracts | Options | Buy/ Purchased
Derivative [Line Items]
Notional Value	7,730	7,810
Fair Value, Assets	159	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	2,742	1,991
Fair Value, Assets	20	8
Fair Value, Liabilities	70	47
Asset and Liability Management Positions | Other economic hedges | Foreign exchange forward contracts
Derivative [Line Items]
Notional Value	813	702
Fair Value, Assets	1	4
Fair Value, Liabilities	4	4
Asset and Liability Management Positions | Other economic hedges | Equity contracts
Derivative [Line Items]
Notional Value	295	293
Fair Value, Assets	10	0
Fair Value, Liabilities	0	9
Asset and Liability Management Positions | Other economic hedges | Credit contracts
Derivative [Line Items]
Notional Value	2,667	3,558
Fair Value, Assets	0	0
Fair Value, Liabilities	20	29
Asset and Liability Management Positions | Fair value hedges | Interest rate contracts | Receive fixed/pay floating swaps
Derivative [Line Items]
Notional Value	15,550	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	28,364	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	24,850	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	1,000	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	732	870
Fair Value, Assets	3	7
Fair Value, Liabilities	$ 2	$ 0