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Accumulated Other Comprehensive Loss - (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Sep. 30, 2014
Unrealized gains (losses) on investment securities:            
Balance at beginning of period $ 252 $ (83) $ (234) $ 158    
Other comprehensive income for period:            
Net unrealized gains (losses) arising during period, net of tax (108) 7 407 (210)    
Reclassification adjustment for gains realized in net income, net of tax [1] (10) (7) (51) (43)    
Amortization of net unrealized losses on securities transferred from available-for-sale to held-to-maturity realized in net income, net of tax [2] 6 5 18 17    
Total other comprehensive income (loss) for period (112) 5 374 (236)    
Balance at end of period 140 (78) 140 (78)    
Unrealized (losses) gains on derivatives classified as cash flow hedges:            
Balance at beginning of period (226) (144) (170) (156)    
Other comprehensive income (loss) for period:            
Net unrealized losses arising during period, net of tax 6 (34) (56) (25)    
Reclassification adjustment of losses realized in net income, net of tax 3 2 9 [3] 5 [3]    
Total other comprehensive income (loss) for period 9 (32) (47) (20)    
Balance at end of period (217) (176) (217) (176)    
Pension and postretirement benefit liability:            
Balance at beginning of period (3) (2) (3) (3)    
Other comprehensive income for period:            
Change in unfunded pension and postretirement liability, net of tax     0 1    
Total other comprehensive income for period 0 0 0 1    
Balance at end of period (3) (2) (3) (2)    
Total accumulated other comprehensive loss at end of period $ (80) $ (256) $ (80) $ (256) $ (407)  
AOCI included in pretax unrealized losses           $ 234
[1] Amount reclassified to net income is included in other securities gains, net in our consolidated statement of income.
[2] Amount amortized to net income is included in interest income in our consolidated statement of income. During 2014, we transferred securities from available-for-sale to held-to-maturity. At the date of transfer, AOCI included net pretax unrealized losses of $234 million related to the transferred securities which will be amortized over the remaining contractual life of each security as an adjustment of yield in a manner consistent with the amortization of any premium or discount.
[3] Amount reclassified to net income is included in interest income (expense) in our consolidated statement of income.