Derivative Financial Instruments - Balance Sheet Offsetting, Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivative Assets
Gross Amounts of Recognized Assets	$ 288	$ 285
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	288	285
Financial Instruments	(169)	(145)
Cash Collateral Received	(60)	(21)
Net Amount	59	119
Reverse repurchase, securities borrowing, and similar arrangements
Gross Amounts of Recognized Assets	607	227
Gross Amounts offset in the Statement of Financial Position	0	0
Securities purchased under agreements to resell	607	227
Financial Instruments	(607)	(227)
Cash Collateral Received	0	0
Net Amount	0	0
Total
Gross Amounts of Recognized Assets	895	512
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	895	512
Financial Instruments	(776)	(372)
Cash Collateral Received	(60)	(21)
Net Amount	59	119
Interest rate swaps
Derivative Assets
Gross Amounts of Recognized Assets	18	0
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	18	0
Financial Instruments	0	0
Cash Collateral Received	(13)	0
Net Amount	5	0
Foreign exchange forwards
Derivative Assets
Gross Amounts of Recognized Assets	162	215
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	162	215
Financial Instruments	(77)	(76)
Cash Collateral Received	(32)	(21)
Net Amount	53	118
Client foreign currency options
Derivative Assets
Gross Amounts of Recognized Assets	9	2
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	9	2
Financial Instruments	(1)	(1)
Cash Collateral Received	(7)	0
Net Amount	1	1
Client interest rate derivatives
Derivative Assets
Gross Amounts of Recognized Assets	99	68
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	99	68
Financial Instruments	(91)	(68)
Cash Collateral Received	(8)	0
Net Amount	$ 0	$ 0