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Quarterly Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Total net revenue $ 637 $ 599 $ 577 $ 553 $ 509 $ 486 $ 474 $ 472 $ 2,366 $ 1,941 $ 1,370
Net income $ 129 $ 147 $ 193 $ 145 $ 127 $ 139 $ 133 $ 153 $ 614 $ 552 $ 268
Earnings per share:                      
Basic (in dollars per share) $ 0.48 $ 0.49 $ 0.70 $ 0.48 $ 0.46 $ 0.51 $ 0.48 $ 0.54 $ 2.16 $ 1.99 $ 0.92
Diluted (in dollars per share) $ 0.48 $ 0.49 $ 0.70 $ 0.48 $ 0.46 $ 0.51 $ 0.48 $ 0.53 $ 2.15 $ 1.98 $ 0.91
Income Statement [Abstract]                      
Provision (benefit) for loan losses     $ (99)           $ (168) $ (149) $ (40)
Gains (losses) on early extinguishment of debt   $ (58)             (58) $ 0 $ (112)
Additional tax expense related to the federal tax reform law $ 58               $ 58