Variable Interest Entities - Summary of Assets and Liabilities Related to Consolidated Variable Interest Entities (Details) - USD ($) $ in Millions		Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Variable Interest Entity [Line Items]
Consolidated Assets		$ 189,232	[1]	$ 196,434	[1]	$ 175,375
Consolidated Liabilities	[1]	172,192		178,143
Variable interest entities
Variable Interest Entity [Line Items]
Consolidated Assets		101		89
Consolidated Liabilities		9		10
Low income housing limited liability partnership: | Variable interest entities
Variable Interest Entity [Line Items]
Consolidated Assets		54		79
Consolidated Liabilities		7		9
Low income housing limited liability partnership: | Variable interest entities | Other assets:
Variable Interest Entity [Line Items]
Consolidated Assets		54		79
Low income housing limited liability partnership: | Variable interest entities | Interest, taxes and other liabilities
Variable Interest Entity [Line Items]
Consolidated Liabilities		7		9
Venture debt financing entity: | Variable interest entities
Variable Interest Entity [Line Items]
Consolidated Assets		47		10
Consolidated Liabilities		2		1
Venture debt financing entity: | Variable interest entities | Other assets:
Variable Interest Entity [Line Items]
Consolidated Assets		1		0
Venture debt financing entity: | Variable interest entities | Loans
Variable Interest Entity [Line Items]
Consolidated Assets		46		10
Venture debt financing entity: | Variable interest entities | Interest, taxes and other liabilities
Variable Interest Entity [Line Items]
Consolidated Liabilities		$ 2		$ 1

[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