Derivative Financial Instruments - Balance Sheet Offsetting, Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Derivative Liabilities
Gross Amounts of Recognized Liabilities	$ 284	$ 238
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	284	238
Financial Instruments (Collateral)	(159)	(101)
Cash Collateral Pledged	(53)	(61)
Net Amount	72	76
Repurchase, securities lending, and similar arrangements
Securities Sold under Agreements to Repurchase, Gross	63	61
Securities Sold under Agreements to Repurchase, Asset	0	0
Securities Sold under Agreements to Repurchase	63	61
Financial Instruments (Collateral)	0	0
Cash Collateral Pledged	0	0
Net Amount	63	61
Total
Gross Amounts of Recognized Liabilities	347	299
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	347	299
Financial Instruments (Collateral)	(159)	(101)
Cash Collateral Pledged	(53)	(61)
Net Amount	135	137
Foreign exchange forwards and swaps
Derivative Liabilities
Gross Amounts of Recognized Liabilities	157	128
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	157	128
Derivative Liability, Not Offset, Policy Election Deduction	(76)	(55)
Cash Collateral Pledged	(16)	(4)
Net Amount	65	69
Total return swaps
Derivative Liabilities
Gross Amounts of Recognized Liabilities	8
Gross Amounts offset in the Statement of Financial Position	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	8
Derivative Liability, Not Offset, Policy Election Deduction	0
Cash Collateral Pledged	(8)
Net Amount	0
Client foreign currency options
Derivative Liabilities
Gross Amounts of Recognized Liabilities	10	9
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	10	9
Derivative Liability, Not Offset, Policy Election Deduction	(3)	(2)
Cash Collateral Pledged	0	0
Net Amount	7	7
Client interest rate derivatives
Derivative Liabilities
Gross Amounts of Recognized Liabilities	109	101
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	109	101
Derivative Liability, Not Offset, Policy Election Deduction	(80)	(44)
Cash Collateral Pledged	(29)	(57)
Net Amount	$ 0	$ 0