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Loans - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans and Leases Receivable, Gain (Loss) on Sales, Net $ 45   $ 47    
Long-term Debt [1] 20,369   20,369   $ 15,072
Other Short-term Borrowings 5,061   5,061   4,857
Loans held for investment [2] 158,455   158,455   151,839
Finance Leases Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment $ 4,000   $ 4,000   $ 4,100
Federal National Mortgage Association (FNMA) Insured Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage of Loan Portfolio Current 29.00%   29.00%   27.00%
Loans held for investment $ 457   $ 457   $ 459
Government Guarantee Percent 1.00%   1.00%   1.00%
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage of Loan Portfolio Current 78.00%   78.00%   72.00%
Loans held for investment $ 7,146   $ 7,146   $ 7,229
Consumer Indirect [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment 14,060   14,060   12,419
Residential Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment $ 38,100   $ 38,100   $ 38,900
Percentage of Loans Held for Investment 24.00%   24.00%   26.00%
Commercial Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment $ 85,007   $ 85,007   $ 80,940
Geographic Distribution, Foreign [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment 1,900   1,900   1,800
Home Equity Line of Credit [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment [3] 8,696   8,696   9,468
Minimum [Member] | Commercial Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans And Leases Receivable Individually Evaluated For Impairment 3   3   3
Home Equity Line of Credit [Member] | Credit Concentration Risk [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Unused Commitments to Extend Credit 10,600   10,600   10,300
Mortgage Loans on Real Estate [Member] | Credit Concentration Risk [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Unused Commitments to Extend Credit 5,700   5,700   2,700
Federal Home Loan Bank Advances [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Long-term Debt 7,500   7,500   $ 5,000
Consumer Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, Sale [4],[5] 0 $ 0 432 $ 100  
Commercial Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, Sale [4],[5] 171 14 387 87  
Non-recurring loan purchase [Member] | Consumer Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, Purchase [6],[7] 160 101 418 101  
Recurring loan purchase [Member] | Consumer Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, Purchase [7],[8] $ 517 $ 545 $ 1,433 $ 1,568  
[1] Includes debt of consolidated VIEs of $143 million and $161 million at September 30, 2019 and December 31, 2018, respectively.
[2] Includes LHFI of consolidated VIEs of $136 million and $153 million at September 30, 2019 and December 31, 2018, respectively.
[3] Excludes $7.1 billion and $7.2 billion of guaranteed student loans and $457 million and $459 million of guaranteed residential mortgages at September 30, 2019 and December 31, 2018, respectively, for which there was nominal risk of principal loss due to the government guarantee.
[4] Excludes sales of loans originated for sale and loans recorded at fair value conducted in the normal course of business.
[5] The net gain on LHFI sales was $47 million for the nine months ended September 30, 2019, and was immaterial for the three months ended September 30, 2019 as well as the three and nine months ended September 30, 2018.
[6] Purchases are episodic in nature and are conducted based on specific business strategies.
[7] Represents UPB of loans purchased.
[8] Purchases are routine in nature and are conducted in the normal course of business.