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Fair Values of Assets and Liabilities - Losses Recognized Related to Nonrecurring Fair Value Measurements of Individual Assets or Portfolios (Detail) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Loans Receivable [Member]        
Fair Value Assets Measured On Nonrecurring Basis Losses Recognized [Line Items]        
Losses recognized related to nonrecurring fair value measurements $ 18 $ 38 $ 41 $ 75
Other Assets [Member]        
Fair Value Assets Measured On Nonrecurring Basis Losses Recognized [Line Items]        
Losses recognized related to nonrecurring fair value measurements $ 8 $ 5 $ 13 $ 12