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Variable Interest Entities (Details) - Variable Interest Entity, Primary Beneficiary [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Variable Interest Entity [Line Items]    
Cash Collateral to Support Wholesale Transactions $ 0 $ 0
Minimum [Member]    
Variable Interest Entity [Line Items]    
Cash Contribution Collateral to Support Wholesale Securitization Program 0 0
Maximum [Member]    
Variable Interest Entity [Line Items]    
Cash Contribution Collateral to Support Wholesale Securitization Program $ 0 $ 179