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Other Comprehensive Income - Changes in AOCI, Net of Tax, by Component (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Balance at beginning of period $ 4,409
Other comprehensive (loss) income before reclassifications (21)
Amounts reclassified from AOCI (2)
Net current period other comprehensive (loss) income (23)
Balance at end of period 4,608
Unrealized Net Gains (Losses) on Debt Securities Available for Sale  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Balance at beginning of period (29)
Other comprehensive (loss) income before reclassifications (17)
Amounts reclassified from AOCI 0
Net current period other comprehensive (loss) income (17)
Balance at end of period (46)
Unrealized Net Gains (Losses) on Derivative Instruments  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Balance at beginning of period 5
Other comprehensive (loss) income before reclassifications (2)
Amounts reclassified from AOCI (2)
Net current period other comprehensive (loss) income (4)
Balance at end of period 1
Unrecognized Pension and Postretirement Obligations  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Balance at beginning of period (59)
Other comprehensive (loss) income before reclassifications (2)
Amounts reclassified from AOCI 0
Net current period other comprehensive (loss) income (2)
Balance at end of period (61)
Accumulated Other Comprehensive Income (Loss)  
AOCI Attributable to Parent, Net of Tax [Roll Forward]  
Balance at beginning of period (83)
Balance at end of period $ (106)