Derivative Financial Instruments - Balance Sheet Offsetting, Assets (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Derivative Assets
Gross Amounts of Recognized Assets	$ 230	$ 288
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	230	288
Financial Instruments (Collateral)	(110)	(169)
Cash Collateral Received	(34)	(60)
Net Amount	86	59
Reverse repurchase, securities borrowing, and similar arrangements
Gross Amounts of Recognized Assets	420	607
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	420	607
Financial Instruments (Collateral)	(420)	(607)
Cash Collateral Received	0	0
Net Amount	0	0
Total
Gross Amounts of Recognized Assets	650	895
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	650	895
Financial Instruments (Collateral)	(530)	(776)
Cash Collateral Received	(34)	(60)
Net Amount	86	59
Interest rate swaps
Derivative Assets
Gross Amounts of Recognized Assets		18
Gross Amounts offset in the Statement of Financial Position		0
Net Amounts of Assets Presented in the Statement of Financial Position		18
Derivative Asset, Not Offset, Policy Election Deduction		0
Cash Collateral Received		(13)
Net Amount		5
Foreign exchange forwards and swaps
Derivative Assets
Gross Amounts of Recognized Assets	169	162
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	169	162
Derivative Asset, Not Offset, Policy Election Deduction	(63)	(77)
Cash Collateral Received	(23)	(32)
Net Amount	83	53
Client foreign currency options
Derivative Assets
Gross Amounts of Recognized Assets	10	9
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	10	9
Derivative Asset, Not Offset, Policy Election Deduction	(7)	(1)
Cash Collateral Received	0	(7)
Net Amount	3	1
Client interest rate derivatives
Derivative Assets
Gross Amounts of Recognized Assets	51	99
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	51	99
Derivative Asset, Not Offset, Policy Election Deduction	(40)	(91)
Cash Collateral Received	(11)	(8)
Net Amount	$ 0	$ 0