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 |