Short-Term Borrowings-Schedule (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020
Short-term Debt [Line Items]
Short-term borrowings	[1]		$ 6,338	$ 4,952
Securities sold under repurchase agreements
Short-term Debt [Line Items]
Short-term borrowings			$ 2,315	$ 1,765
Weighted average interest rate, point in time (percent)			0.05%	0.22%
Loss on extinguishment of certain repurchase agreements		$ (14)
Commercial paper
Short-term Debt [Line Items]
Short-term borrowings			$ 3,683	$ 2,998
Weighted average interest rate, point in time (percent)			0.36%	0.52%
Other
Short-term Debt [Line Items]
Short-term borrowings			$ 340	$ 189

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at December 31, 2021 and 2020. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 27, "Variable Interest Entities," for additional information. At December 31,20212020(in millions)AssetsLoans$46 $10 Other assets55 79 Total assets$101 $89 LiabilitiesInterest, taxes and other liabilities$9 $10 Total liabilities$9 $10