Derivative Instruments - Asset and Liability Management Derivative Positions (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Derivative [Line Items]
Notional Value	$ 1,300,000
Other economic hedges | Equity contracts
Derivative [Line Items]
Notional Value	17	$ 0
Fair Value, Assets	0	0
Fair Value, Liabilities	0	0
Asset and Liability Management Positions
Derivative [Line Items]
Notional Value	111,371	91,328
Fair Value, Assets	378	312
Fair Value, Liabilities	208	241
Asset and Liability Management Positions | Swaps | Visa Class B Shares
Derivative [Line Items]
Fair Value, Liabilities	102	91
Derivative liability notional value	1,000	2,000
Asset and Liability Management Positions | Underwriting Purchase and Sale Commitments
Derivative [Line Items]
Notional Value	732	28
Asset and Liability Management Positions | Other
Derivative [Line Items]
Notional Value	1,841	2,136
Fair Value, Assets	9	11
Fair Value, Liabilities	105	93
Asset and Liability Management Positions | Other economic hedges | Interest rate contracts | Receive fixed/pay floating swaps
Derivative [Line Items]
Notional Value	11,532	7,029
Fair Value, Assets	162	9
Fair Value, Liabilities	1	3
Asset and Liability Management Positions | Other economic hedges | Interest rate contracts | Pay fixed/receive floating swaps
Derivative [Line Items]
Notional Value	2,792	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	6,046	5,006
Fair Value, Assets	12	29
Fair Value, Liabilities	13	5
Asset and Liability Management Positions | Other economic hedges | Interest rate contracts | Futures and forwards | Sell/ Written
Derivative [Line Items]
Notional Value	5,887	4,501
Fair Value, Assets	5	7
Fair Value, Liabilities	14	34
Asset and Liability Management Positions | Other economic hedges | Interest rate contracts | Options | Buy/ Purchased
Derivative [Line Items]
Notional Value	6,560	6,085
Fair Value, Assets	163	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	2,494	3,696
Fair Value, Assets	21	14
Fair Value, Liabilities	40	75
Asset and Liability Management Positions | Other economic hedges | Foreign exchange forward contracts
Derivative [Line Items]
Notional Value	713	734
Fair Value, Assets	1	2
Fair Value, Liabilities	2	5
Asset and Liability Management Positions | Other economic hedges | Equity contracts
Derivative [Line Items]
Notional Value	282	227
Fair Value, Assets	5	2
Fair Value, Liabilities	0	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	27	0
Asset and Liability Management Positions | Fair value hedges | Interest rate contracts | Receive fixed/pay floating swaps
Derivative [Line Items]
Notional Value	12,450	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	31,831	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	24,500	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	885	854
Fair Value, Assets	0	0
Fair Value, Liabilities	$ 6	$ 10