Guarantee Arrangements and Pledged Assets and Repurchase Agreements - Offsetting of Resale and Repurchase Agreements and Securities Borrowing and Lending Agreements (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Securities purchased under agreements to resell, Gross Amounts Recognized	$ 10,968	$ 12,871
Securities purchased under agreements to resell, Gross Amounts Offset in the Balance Sheet	5,209	2,357
Securities purchased under agreements to resell, Net amounts Presented in the Balance Sheet	5,759	10,514
Securities purchased under agreements to resell, Gross Amounts Not Offset in the Balance Sheet, Financial Instruments	5,676	10,464
Securities purchased under agreements to resell, Gross Amounts Not Offset in the Balance Sheet, Cash Collateral Receive / Pledged	13	50
Securities purchased under agreements to resell, Net amount	70	0
Securities sold under repurchase agreements, Gross Amounts Recognized	7,551	4,672
Securities sold under repurchase agreements, Gross Amounts Offset in the Balance Sheet	5,209	2,357
Securities sold under repurchase agreements, Net Amounts Presented in the Balance Sheet	2,342	2,315
Securities sold under repurchase agreements, Gross Amounts Not Offset in the Balance sheet, Financial Instruments	2,313	2,315
Securities sold under repurchase agreements, Gross Amounts Not Offset in the Balance Sheet, Cash Collateral Received / Pledged	29	0
Securities sold under repurchase agreements, Net amount	$ 0	$ 0