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Reconciliation of the Beginning and Ending Balances for Fair Valued Assets and Liabilities Measured on a Recurring Basis Using Significant Unobservable Inputs (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Derivative contracts, net [Member]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 3 $ 6 $ 3 $ 6 $ 3 $ 0 $ 4 $ 6
Included in earnings 18 [1] 52 [2] 36 [1] 157 [2]        
OCI 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0 0 0        
Sales 0 0 0 0        
Settlements 8 1 10 0        
Transfers to other balance sheet line items (26) (51) (43) (157)        
Transfers into Level 3 0 0 0 0        
Transferred Out of Level 3 in The Fair Value Hierarchy 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 10 19 7 17        
Mortgage-backed Securities, Issued by Private Enterprises [Member]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 0 62 0 62   59 67 74
Included in earnings   0 0 0        
OCI   (1) [3] 0 (1) [3]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   0 0 0        
Sales   0 0 0        
Settlements   6 2 13        
Transfers to other balance sheet line items   0 0 0        
Transfers into Level 3   0 0 0        
Transferred Out of Level 3 in The Fair Value Hierarchy   0 (57) 0        
Asset-backed Securities [Member]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 0 8 0 8   8 9 10
Included in earnings   0 0 0        
OCI   0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   0 0 0        
Sales   0 0 0        
Settlements   1 1 2        
Transfers to other balance sheet line items   0 0 0        
Transfers into Level 3   0 0 0        
Transferred Out of Level 3 in The Fair Value Hierarchy   0 (7) 0        
Corporate Debt Securities [Member]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 0 5 0 5   5 5 5
Included in earnings   0 0 0        
OCI   0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   0 0 0        
Sales   0 0 0        
Settlements   0 0 0        
Transfers to other balance sheet line items   0 0 0        
Transfers into Level 3   0 0 0        
Transferred Out of Level 3 in The Fair Value Hierarchy   0 (5) 0        
Available-for-sale Securities [Member]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 0 75 0 75   72 81 93
Included in earnings   0 0 0        
OCI   (1) [3] 0 (1) [3]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   0 0 0        
Sales   0 0 0        
Settlements   7 3 19        
Transfers to other balance sheet line items   0 0 0        
Transfers into Level 3   0 0 0        
Transferred Out of Level 3 in The Fair Value Hierarchy   0 (69) 0        
Residential Mortgage, Loans Held For Sale [Member]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   1   1     2 12
Included in earnings   0   0        
OCI   0   0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   0   0        
Sales   (2)   (22)        
Settlements   1   1        
Transfers to other balance sheet line items   (1)   (3)        
Transfers into Level 3   3   17        
Transferred Out of Level 3 in The Fair Value Hierarchy   0   (2)        
Loans Held-For-Investment [Member]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 168 206 168 206 $ 177 $ 196 214 222
Included in earnings 0 [4] 0 [5] (3) [4] 1 [5]        
OCI 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0 0 0        
Sales 0 0 0 0        
Settlements 9 9 26 24        
Transfers to other balance sheet line items 0 (1) 0 (3)        
Transfers into Level 3 0 0 1 4        
Transferred Out of Level 3 in The Fair Value Hierarchy 0 0 0 0        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) $ 0 [4] 0 $ (4) 1        
US States and Political Subdivisions Debt Securities [Member]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   0   0     $ 0 $ 4
Included in earnings   0   0        
OCI   0   0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   0   0        
Sales   0   0        
Settlements   0   4        
Transfers to other balance sheet line items   0   0        
Transfers into Level 3   0   0        
Transferred Out of Level 3 in The Fair Value Hierarchy   $ 0   $ 0        
[1] Includes issuances, fair value changes, and expirations. Amount related to residential IRLCs is recognized in Mortgage production related income, amount related to commercial IRLCs is recognized in Commercial real estate related income, and amount related to Visa derivative liability is recognized in Other noninterest expense. Included $10 million and $7 million in earnings during the three and nine months ended September 30, 2018, respectively, related to changes in unrealized gains on net derivative instruments still held at September 30, 2018.
[2] Includes issuances, fair value changes, and expirations. Amount related to residential IRLCs is recognized in Mortgage production related income, amount related to commercial IRLCs is recognized in Commercial real estate related income, and amount related to Visa derivative liability is recognized in Other noninterest expense. Included $19 million and $17 million in earnings during the three and nine months ended September 30, 2017, respectively, related to changes in unrealized gains on net derivative instruments still held at September 30, 2017.
[3] Amounts recognized in OCI are included in change in net unrealized gains on securities AFS, net of tax.
[4] Amounts are generally included in Mortgage production related income; however, the mark on certain fair value loans is included in Other noninterest income. Included $0 and $4 million in earnings during the three and nine months ended September 30, 2018, respectively, related to changes in unrealized losses on LHFI still held at September 30, 2018.
[5] Amounts are generally included in Mortgage production related income; however, the mark on certain fair value loans is included in Other noninterest income. Included $0 and $1 million in earnings during the three and nine months ended September 30, 2017, respectively, related to changes in unrealized gains on LHFI still held at September 30, 2017.