Variable Interest Entities - Variable Interests Held by Us and Our Maximum Exposure to Loss Rising From Our Involvements in Those VIEs (Details) - USD ($) $ in Millions		Jun. 30, 2020		Dec. 31, 2019		Jun. 30, 2019
Variable Interest Entity [Line Items]
Assets		$ 212,862	[1]	$ 175,375	[1]	$ 184,063
Liabilities	[1]	194,718		157,119
Variable Interest Entity, Not Primary Beneficiary, Structured Note Vehicles [Member]
Variable Interest Entity [Line Items]
Total Assets Held by Unconsolidated VIEs		1,557		1,524
Assets		510		510
Liabilities		42		9
Maximum Exposure to Loss		1,515		1,515
Variable Interest Entity, Not Primary Beneficiary, Limited Partnership Investments [Member]
Variable Interest Entity [Line Items]
Total Assets Held by Unconsolidated VIEs		2,634		2,160
Assets		597		561
Liabilities		311		300
Maximum Exposure to Loss		597		562
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Total Assets Held by Unconsolidated VIEs		4,191		3,684
Assets		1,107		1,071
Liabilities		353		309
Maximum Exposure to Loss		$ 2,112		$ 2,077

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at June 30, 2020 and December 31, 2019 which are consolidated on our balance sheet. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 17, "Variable Interest Entities," for additional information. Assets: Loans $39 million and $0 million. Other assets $86 million and $98 million. Total assets $125 million and $98 million respectively. Liabilities: Interest, taxes and other liabilities $23 million and $38 million. Total liabilities $23 million and $38 million, respectively.