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Fair Value Measurement - Schedule of Fair Value of Financial Instruments (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Financial assets:    
Securities held to maturity $ 33,900 $ 29,437
Level 1    
Financial assets:    
Cash and cash equivalents 4,547 4,458
Restricted cash for securitization investors 746 312
Securities held to maturity 0 200
Net loans held for investment 0 0
Loans held for sale 0 0
Interest receivable 0 0
Other investments 0 0
Financial liabilities:    
Deposits with defined maturities 0  
Deposits   26,404
Securitized debt obligations 0 0
Senior and subordinated notes 0 0
Federal funds purchased and securities loaned or sold under agreements to repurchase 0 0
Other borrowings 0 0
Interest payable 0 0
Level 2    
Financial assets:    
Cash and cash equivalents 6,335 9,582
Restricted cash for securitization investors 0 0
Securities held to maturity 33,833 29,217
Net loans held for investment 0 0
Loans held for sale 1,421 949
Interest receivable 1,518 1,536
Other investments 1,415 1,680
Financial liabilities:    
Deposits with defined maturities 34,552  
Deposits   217,328
Securitized debt obligations 18,735 20,122
Senior and subordinated notes 31,787 31,392
Federal funds purchased and securities loaned or sold under agreements to repurchase 384 576
Other borrowings 1,826 8,892
Interest payable 391 413
Level 3    
Financial assets:    
Cash and cash equivalents 0 0
Restricted cash for securitization investors 0 0
Securities held to maturity 68 20
Net loans held for investment 234,635 251,468
Loans held for sale 0 3
Interest receivable 0 0
Other investments 0 9
Financial liabilities:    
Deposits with defined maturities 0  
Deposits   0
Securitized debt obligations 0 0
Senior and subordinated notes 0 0
Federal funds purchased and securities loaned or sold under agreements to repurchase 0 0
Other borrowings 0 0
Interest payable 0 0
Carrying Value    
Financial assets:    
Cash and cash equivalents 10,882 14,040
Restricted cash for securitization investors 746 312
Securities held to maturity 34,631 28,984
Net loans held for investment 231,542 246,971
Loans held for sale 1,402 971
Interest receivable 1,518 1,536
Other investments 1,415 1,689
Financial liabilities:    
Deposits with defined maturities 34,618  
Deposits   243,702
Securitized debt obligations 18,649 20,010
Senior and subordinated notes 31,291 30,755
Federal funds purchased and securities loaned or sold under agreements to repurchase 384 576
Other borrowings 1,826 8,892
Interest payable 391 413
Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 10,882 14,040
Restricted cash for securitization investors 746 312
Securities held to maturity 33,901 29,437
Net loans held for investment 234,635 251,468
Loans held for sale 1,421 952
Interest receivable 1,518 1,536
Other investments 1,415 1,689
Financial liabilities:    
Deposits with defined maturities 34,552  
Deposits   243,732
Securitized debt obligations 18,735 20,122
Senior and subordinated notes 31,787 31,392
Federal funds purchased and securities loaned or sold under agreements to repurchase 384 576
Other borrowings 1,826 8,892
Interest payable $ 391 $ 413