Derivative Instruments - Asset and Liability Management Derivative Positions (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Derivative [Line Items]
Notional Value	$ 1,200,000
Asset and Liability Management Positions
Derivative [Line Items]
Notional Value	103,401	$ 91,328
Fair Value, Assets	309	312
Fair Value, Liabilities	202	241
Asset and Liability Management Positions | Swaps | Visa Class B Shares
Derivative [Line Items]
Fair Value, Liabilities	119	91
Derivative liability notional value	1,400	2,000
Asset and Liability Management Positions | Underwriting Purchase and Sale Commitments
Derivative [Line Items]
Notional Value	576	28
Asset and Liability Management Positions | Other
Derivative [Line Items]
Notional Value	2,070	2,136
Fair Value, Assets	8	11
Fair Value, Liabilities	120	93
Asset and Liability Management Positions | Other economic hedges | Interest rate contracts | Receive fixed/pay floating swaps
Derivative [Line Items]
Notional Value	9,287	7,029
Fair Value, Assets	89	9
Fair Value, Liabilities	2	3
Asset and Liability Management Positions | Other economic hedges | Interest rate contracts | Pay fixed/receive floating swaps
Derivative [Line Items]
Notional Value	3,354	3,801
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	4,460	5,006
Fair Value, Assets	7	29
Fair Value, Liabilities	9	5
Asset and Liability Management Positions | Other economic hedges | Interest rate contracts | Futures and forwards | Sell/ Written
Derivative [Line Items]
Notional Value	2,757	4,501
Fair Value, Assets	3	7
Fair Value, Liabilities	7	34
Asset and Liability Management Positions | Other economic hedges | Interest rate contracts | Options | Buy/ Purchased
Derivative [Line Items]
Notional Value	5,090	6,085
Fair Value, Assets	182	237
Fair Value, Liabilities	0	0
Asset and Liability Management Positions | Other economic hedges | Interest rate contracts | Options | Sell/ Written
Derivative [Line Items]
Notional Value	2,331	3,696
Fair Value, Assets	17	14
Fair Value, Liabilities	53	75
Asset and Liability Management Positions | Other economic hedges | Foreign exchange forward contracts
Derivative [Line Items]
Notional Value	704	734
Fair Value, Assets	1	2
Fair Value, Liabilities	0	5
Asset and Liability Management Positions | Other economic hedges | Equity contracts
Derivative [Line Items]
Notional Value	267	227
Fair Value, Assets	1	2
Fair Value, Liabilities	1	0
Asset and Liability Management Positions | Other economic hedges | Credit contracts
Derivative [Line Items]
Notional Value	3,558	2,620
Fair Value, Assets	0	1
Fair Value, Liabilities	9	0
Asset and Liability Management Positions | Fair value hedges | Interest rate contracts | Receive fixed/pay floating swaps
Derivative [Line Items]
Notional Value	15,700	12,100
Fair Value, Assets	0	0
Fair Value, Liabilities	0	16
Asset and Liability Management Positions | Fair value hedges | Interest rate contracts | Pay fixed/receive floating swaps
Derivative [Line Items]
Notional Value	28,581	24,139
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	24,400	18,400
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	842	854
Fair Value, Assets	1	0
Fair Value, Liabilities	$ 1	$ 10