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COMMITMENTS, GUARANTEES, PRODUCT WARRANTIES AND OTHER LOSS CONTINGENCIES - Rollforward of the Reserve (Details) - Disposed of by Sale - WMC - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Loss Contingency Accrual        
Balance, beginning of period $ 626 $ 833 $ 626 $ 875
Provision 10 27 10 84
Claim resolutions / rescissions 0 0 0 (99)
Balance, end of period $ 636 $ 860 $ 636 $ 860