Derivative Financial Instruments - Total Notional or Contractual Amounts, Fair Value, Collateral and Net Exposure of Derivative Financial Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Fair Value, Derivative Assets	$ 382	$ 165
Fair Value, Derivative Liabilities	234	148
Derivative Assets, Total Gross Derivatives	903	565
Derivative Liabilities, Total Gross Derivatives	556	238
Less: netting adjustment (Derivative Assets)	(351)	(137)
Less: netting adjustment (Derivative Liabilities)	(223)	(120)
Derivative Assets, Total derivatives	552	428
Derivative Liabilities, Total derivatives	333	118
Cash collateral in excess of net derivative receivables	(31)
Cash collateral in excess of net derivative payables		1
Derivatives designated as hedging instruments
Derivative [Line Items]
Fair Value, Derivative Assets	17	18
Fair Value, Derivative Liabilities	56
Derivatives designated as hedging instruments | Interest rate swaps | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	550	10,700
Fair Value, Derivative Assets	0	18
Approximate reduction amounts of derivative assets reflecting variation margin treated as settlement of the related derivative fair values	(74)
Derivatives designated as hedging instruments | Foreign exchange contracts | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	778
Fair Value, Derivative Assets	17
Derivatives designated as hedging instruments | Foreign exchange contracts | Other liability
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	616
Fair Value, Derivative Liabilities	56
Derivatives not designated as hedging instruments
Derivative [Line Items]
Fair Value, Derivative Assets	886	547
Fair Value, Derivative Liabilities	500	238
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	1,763	701
Fair Value, Derivative Assets	42	16
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other liability
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	2,184	62
Fair Value, Derivative Liabilities	29	2
Derivatives not designated as hedging instruments | Equity warrant assets | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	375	322
Fair Value, Derivative Assets	383	277
Derivatives not designated as hedging instruments | Contingent conversion rights | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	92
Fair Value, Derivative Assets	12
Derivatives not designated as hedging instruments | Client foreign exchange forwards | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	10,145	8,245
Fair Value, Derivative Assets	262	146
Derivatives not designated as hedging instruments | Client foreign exchange forwards | Other liability
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	9,960	7,764
Fair Value, Derivative Liabilities	257	126
Derivatives not designated as hedging instruments | Total Return Swap | Other assets
Derivative [Line Items]
Fair Value, Derivative Assets	40	0
Derivatives not designated as hedging instruments | Total Return Swap | Other liability
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	119	0
Derivatives not designated as hedging instruments | Client foreign currency options | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	866	688
Fair Value, Derivative Assets	19	9
Derivatives not designated as hedging instruments | Client foreign currency options | Other liability
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	866	688
Fair Value, Derivative Liabilities	19	9
Derivatives not designated as hedging instruments | Client interest rate derivatives | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	2,391	2,178
Fair Value, Derivative Assets	128	99
Derivatives not designated as hedging instruments | Client interest rate derivatives | Other liability
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	2,709	2,315
Fair Value, Derivative Liabilities	$ 195	101
Approximate reduction amounts of derivative assets reflecting variation margin treated as settlement of the related derivative fair values		$ (112)