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Accumulated Other Comprehensive Loss - (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
Unrealized gains (losses) on investment securities:          
Balance at beginning of period $ (299) $ (461)      
Other comprehensive income for period:          
Net unrealized gains (losses) arising during period, net of tax of $(63) million and $64 million, respectively (193) 106      
Reclassification adjustment for gains realized in net income (loss), net of tax of $(1) million and $(2) million, respectively(2) [1] (4) (3)      
Amortization of net unrealized losses on securities transferred from available-for-sale to held-to-maturity realized in net income (loss), net of tax of $1 million and $3 million, respectively(3) [2] 2 4      
Total other comprehensive income (loss) for period (195) 107      
Balance at end of period (494) (354)      
Unrealized gains (losses) on fair value option liabilities attributable to our own credit spread:          
Balance at beginning of period (23) 174      
Other comprehensive income (loss) for period:          
Net unrealized gains (losses) arising during period, net of tax of $5 million and $(46) million, respectively 12 (79)      
Total other comprehensive income (loss) for period 12 (79)      
Balance at end of period (11) 95      
Unrealized gains (losses) on derivatives designated as cash flow hedges:          
Balance at beginning of period (199) (157)      
Other comprehensive income (loss) for period:          
Net unrealized losses arising during period, net of tax is less then $(1) million and less than $(1) million, respectively (1) (1)      
Reclassification adjustment for losses realized in net income (loss), net of tax of $1 million and $1 million, respectively(5) [3] 3 2      
Total other comprehensive income (loss) for period 2 1      
Balance at end of period (197) (156)      
Pension and postretirement benefit liability:          
Balance at beginning of period 3 0      
Change in unfunded pension and postretirement liability, net of tax of less then $1 million and less then $1 million, respectively 1 0      
Total other comprehensive income for period 1 0      
Balance at end of period 4 0      
Total accumulated other comprehensive loss at end of period (698) (415) $ (431)    
AOCI included in pretax unrealized losses         $ 234
As Previously Reported [Member]          
Unrealized gains (losses) on investment securities:          
Balance at beginning of period (250) (461)      
Unrealized gains (losses) on fair value option liabilities attributable to our own credit spread:          
Balance at beginning of period (19) 0      
Unrealized gains (losses) on derivatives designated as cash flow hedges:          
Balance at beginning of period (164) (157)      
Pension and postretirement benefit liability:          
Balance at beginning of period $ 2 $ 0      
Accounting Standards Update 2016-01, Equity Investments Previously Classified as Available-for-sale [Member] | Unrealized Gains (Losses) on Investment Securities [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Cumulative effect of new accounting principle in period of adoption [4]     4 $ 0  
Accounting Standards Update 2018-02 [Member] | Unrealized Gains (Losses) on Investment Securities [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Cumulative effect of new accounting principle in period of adoption [4]     (53) 0  
Accounting Standards Update 2018-02 [Member] | Unrealized Gains (Losses) on Fair Value Option Liabilities Attributable to Our Own Credit Spread [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Cumulative effect of new accounting principle in period of adoption [4]     (4) 0  
Accounting Standards Update 2018-02 [Member] | Unrealized Gains (Losses) on Investment Securities [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Cumulative effect of new accounting principle in period of adoption [4]     (35) 0  
Accounting Standards Update 2018-02 [Member] | Pension and Postretirement Benefit Liability [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Cumulative effect of new accounting principle in period of adoption [4]     1 0  
Accounting Standards Update 2016-01, Fair Value Option [Member] | Unrealized Gains (Losses) on Fair Value Option Liabilities Attributable to Our Own Credit Spread [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Cumulative effect of new accounting principle in period of adoption [5]     $ 0 $ 174  
[1] Amount reclassified to net income (loss) is included in other securities gains, net in our consolidated statement of income (loss).
[2] Amount amortized to net income (loss) is included in interest income in our consolidated statement of income (loss). 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 are being 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 (loss) is included in interest income (expense) in our consolidated statement of income (loss).
[4] See Note 21, "New Accounting Pronouncements," for additional discussion.
[5] See Note 2, "Summary of Significant Accounting Polices and New Accounting Pronouncements," in our 2017 Form 10-K for additional discussion.