Variable Interest Entities - Summary of Assets and Liabilities Related to Consolidated Variable Interest Entities (Details) - USD ($) $ in Millions		Mar. 31, 2022		Dec. 31, 2021		Mar. 31, 2021
Variable Interest Entity [Line Items]
Consolidated Assets		$ 177,016	[1]	$ 189,232	[1]	$ 194,856
Consolidated Liabilities	[1]	160,943		172,192
Variable interest entities
Variable Interest Entity [Line Items]
Consolidated Assets		179		101
Consolidated Liabilities		31		9
Low income housing limited liability partnership: | Variable interest entities
Variable Interest Entity [Line Items]
Consolidated Assets		50		54
Consolidated Liabilities		29		7
Low income housing limited liability partnership: | Variable interest entities | Other assets:
Variable Interest Entity [Line Items]
Consolidated Assets		50		54
Low income housing limited liability partnership: | Variable interest entities | Interest, taxes and other liabilities
Variable Interest Entity [Line Items]
Consolidated Liabilities		29		7
Venture debt financing entity: | Variable interest entities
Variable Interest Entity [Line Items]
Consolidated Assets		129		47
Consolidated Liabilities		2		2
Venture debt financing entity: | Variable interest entities | Other assets:
Variable Interest Entity [Line Items]
Consolidated Assets		1		1
Venture debt financing entity: | Variable interest entities | Loans
Variable Interest Entity [Line Items]
Consolidated Assets		128		46
Venture debt financing entity: | Variable interest entities | Interest, taxes and other liabilities
Variable Interest Entity [Line Items]
Consolidated Liabilities		$ 2		$ 2

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at March 31, 2022 and December 31, 2021. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 17, "Variable Interest Entities," for additional information. March 31, 2022December 31, 2021(in millions)AssetsLoans$128 $46 Other assets51 55 Total assets$179 $101 LiabilitiesInterest, taxes and other liabilities$31 $9 Total liabilities$31 $9