Derivative Financial Instruments - Total Notional or Contractual Amounts, Fair Value, Collateral and Net Exposure of Derivative Financial Instruments (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Derivative [Line Items]
Derivative Assets, Fair Value	$ 597	$ 165
Derivative Liabilities, Fair Value	256	148
Derivative Assets, Total Gross Derivatives	1,161	565
Derivative Liabilities, Total Gross Derivatives	758	238
Less: netting adjustment (Derivative Assets)	(495)	(137)
Less: netting adjustment (Derivative Liabilities)	(234)	(120)
Derivative Assets, Total derivatives	666	428
Derivative Liabilities, Total derivatives	524	118
Approximate reduction amounts of derivative assets reflecting variation margin treated as settlement of the related derivative fair values	117	112
Cash collateral in excess of net derivative receivables	6
Cash collateral in excess of net derivative payables		1
Derivatives designated as hedging instruments
Derivative [Line Items]
Derivative Assets, Fair Value	94	18
Derivatives designated as hedging instruments | Interest rate swaps | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	0	10,700
Derivative Assets, Fair Value	0	18
Derivatives designated as hedging instruments | Foreign exchange contracts | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	1,546
Derivative Assets, Fair Value	94	0
Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative Assets, Fair Value	1,067	547
Derivative Liabilities, Fair Value	758	238
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	2,860	701
Derivative Assets, Fair Value	46	16
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other liabilities
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	308	62
Derivative Liabilities, Fair Value	13	2
Derivatives not designated as hedging instruments | Equity warrant assets | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	353	322
Derivative Assets, Fair Value	351	277
Derivatives not designated as hedging instruments | Contingent conversion rights | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	52
Derivative Assets, Fair Value	6
Derivatives not designated as hedging instruments | Client foreign exchange contracts | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	10,658	8,245
Derivative Assets, Fair Value	500	146
Derivatives not designated as hedging instruments | Client foreign exchange contracts | Other liabilities
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	10,615	7,764
Derivative Liabilities, Fair Value	499	126
Derivatives not designated as hedging instruments | Total return swaps | Other assets
Derivative [Line Items]
Derivative Assets, Fair Value	25	0
Derivatives not designated as hedging instruments | Total return swaps | Other liabilities
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	110	0
Derivatives not designated as hedging instruments | Client foreign currency options | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	266	688
Derivative Assets, Fair Value	11	9
Derivatives not designated as hedging instruments | Client foreign currency options | Other liabilities
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	266	688
Derivative Liabilities, Fair Value	11	9
Derivatives not designated as hedging instruments | Client interest rate derivatives | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	2,248	2,178
Derivative Assets, Fair Value	128	99
Derivatives not designated as hedging instruments | Client interest rate derivatives | Other liabilities
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	2,447	2,315
Derivative Liabilities, Fair Value	$ 235	$ 101