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Derivative contracts - gains and losses (Detail) - Finance and Financial Products [Member] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative gains/losses $ (174) $ 155 $ 1,144 $ 391
Not Designated as Hedging Instrument [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative gains/losses (174) 155 1,144 391
Not Designated as Hedging Instrument [Member] | Equity Index Put Options [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative gains/losses (138) 65 1,173 (67)
Not Designated as Hedging Instrument [Member] | Credit Default [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative gains/losses $ (36) 84 $ (29) 457
Not Designated as Hedging Instrument [Member] | Other, Principally Interest Rate and Foreign Currency [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative gains/losses   $ 6   $ 1