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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Interest income $ 958 $ 933 $ 905 $ 862 $ 857 $ 808 $ 772 $ 759 $ 3,658 $ 3,196 $ 3,110
Interest expense 229 227 220 200 204 207 203 202 875 816 856
Provision for finance receivable losses 278 256 260 254 231 243 236 245 1,048 955 932
Other revenues 153 144 140 137 146 152 121 141 574 560 773
Other expenses 390 395 522 377 381 389 388 396 1,685 1,554 1,739
Income (loss) before income tax expense (benefit) 214 199 43 168 187 121 66 57 624 431 356
Income tax expense (benefit) 46 51 36 44 148 52 24 24 177 248 113
Net income $ 168 $ 148 $ 7 $ 124 $ 39 $ 69 $ 42 $ 33 $ 447 $ 183 $ 243
Earnings per share:                      
Basic (in dollars per share) $ 1.24 $ 1.09 $ 0.05 $ 0.91 $ 0.29 $ 0.52 $ 0.31 $ 0.25 $ 3.29 $ 1.35 $ 1.60
Diluted (in dollars per share) $ 1.24 $ 1.09 $ 0.05 $ 0.91 $ 0.29 $ 0.51 $ 0.30 $ 0.25 $ 3.29 $ 1.35 $ 1.59