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Investment Securities - Schedule of Credit Losses Related to Debt Securities Recognized in Earnings (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]        
Credit loss component, beginning of period $ 192 $ 165 $ 175 $ 160
Additions:        
Initial credit impairment 2 1 7 2
Subsequent credit impairment 3 2 15 6
Total additions 5 3 22 8
Reductions due to payoffs, disposals, transfers and other (1) (2) (1) (2)
Credit loss component, end of period $ 196 $ 166 $ 196 $ 166