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Equity (Deficit) Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity [Abstract]      
Net unrealized gains on AFS securities for which we have not recorded OTTI $ 87 $ 135 $ 455
Net unrealized gains on AFS securities for which we have recorded OTTI 423 581 903
Other 43 43 49
Accumulated other comprehensive income $ 553 $ 759 $ 1,407