Derivative Financial Instruments - Balance Sheet Offsetting, Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivative Liabilities
Gross Amounts of Recognized Liabilities	$ 238	$ 237
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	238	237
Financial Instruments	(101)	(85)
Cash Collateral Pledged	(61)	(71)
Net Amount	76	81
Repurchase, securities lending, and similar arrangements
Securities Sold under Agreements to Repurchase, Gross	61	0
Securities Sold under Agreements to Repurchase, Asset	0	0
Securities Sold under Agreements to Repurchase	61	0
Financial Instruments	0	0
Cash Collateral Pledged	0	0
Net Amount	61	0
Total
Gross Amounts of Recognized Liabilities	299	237
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	299	237
Financial Instruments	(101)	(85)
Cash Collateral Pledged	(61)	(71)
Net Amount	137	81
Interest rate swaps
Derivative Liabilities
Gross Amounts of Recognized Liabilities	0	0
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	0	0
Financial Instruments	0	0
Cash Collateral Pledged	0	0
Net Amount	0	0
Foreign exchange forwards
Derivative Liabilities
Gross Amounts of Recognized Liabilities	128	208
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	128	208
Financial Instruments	(55)	(84)
Cash Collateral Pledged	(4)	(45)
Net Amount	69	79
Client foreign currency options
Derivative Liabilities
Gross Amounts of Recognized Liabilities	9	2
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	9	2
Financial Instruments	(2)	(1)
Cash Collateral Pledged	0	0
Net Amount	7	1
Client interest rate derivatives
Derivative Liabilities
Gross Amounts of Recognized Liabilities	101	27
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	101	27
Financial Instruments	(44)	0
Cash Collateral Pledged	(57)	(26)
Net Amount	$ 0	$ 1