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Loans - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans and Leases Receivable, Gain (Loss) on Sales, Net $ 45   $ 45    
Long-term Debt [1] 20,200   20,200   $ 15,072
Other Short-term Borrowings 7,396   7,396   4,857
Loans held for investment 156,589   156,589   151,839
Finance Leases Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment $ 4,100   $ 4,100   $ 4,059
Federal National Mortgage Association (FNMA) Insured Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage of Loan Portfolio Current 28.00%   28.00%   27.00%
Loans held for investment $ 439   $ 439   $ 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 76.00%   76.00%   72.00%
Loans held for investment $ 7,200   $ 7,200   $ 7,229
Consumer Indirect [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment 13,598   13,598   12,419
Residential Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment $ 38,300   $ 38,300   $ 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 $ 83,991   $ 83,991   $ 80,940
Geographic Distribution, Foreign [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment 1,800   1,800   1,801
Home Equity Line of Credit [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment [2] 8,902   8,902   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 5,300   5,300   2,700
Federal Home Loan Bank Advances [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Long-term Debt 9,800   9,800   $ 5,000
Consumer Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, Significant Sales [3],[4] 432 $ 100 432 $ 100  
Commercial Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, Significant Sales [3],[4] 177 37 217 72  
Non-recurring loan purchase [Member] | Consumer Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, Significant Purchases [5],[6] 85 0 258 0  
Recurring loan purchase [Member] | Consumer Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, Significant Purchases [6],[7] $ 471 $ 548 $ 916 $ 1,023  
[1] Includes debt of consolidated VIEs of $149 million and $161 million at June 30, 2019 and December 31, 2018, respectively.
[2] Excludes $7.2 billion of guaranteed student loans at both June 30, 2019 and December 31, 2018, and $439 million and $459 million of guaranteed residential mortgages at June 30, 2019 and December 31, 2018, respectively, for which there was nominal risk of principal loss due to the government guarantee.
[3] Excludes sales of loans originated for sale and loans recorded at fair value conducted in the normal course of business.
[4] Net gain on loan sales totaled $45 million for both the three and six months ended June 30, 2019, and was immaterial for the three and six months ended June 30, 2018.

[5] Purchases are episodic in nature and are conducted based on specific business strategies.
[6] Represents UPB of loans purchased.
[7] Purchases are routine in nature and are conducted in the normal course of business.