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Capital Stock and Earnings Per Share - Earnings Per Share (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
Numerator (basic and diluted):                      
Net income attributable to OneMain Holdings, Inc.                 $ 447 $ 183 $ 215
Denominator:                      
Weighted average number of shares outstanding (basic) (in shares)                 135,702,989 135,249,314 134,718,588
Effect of dilutive securities (in shares)                 331,154 429,677 417,272
Weighted average number of shares outstanding (diluted) (in shares)                 136,034,143 135,678,991 135,135,860
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
Performance-based shares                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Shares excluded in the diluted earnings per share calculation                 40,593 59,863 508,340
Service-based shares                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Shares excluded in the diluted earnings per share calculation                 246,913 674,472 778,121