Stock-Based Compensation - Schedule of RSU Activity (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
---|---|---|---|---|
Sep. 30, 2019 |
Sep. 30, 2018 |
Sep. 30, 2019 |
Sep. 30, 2018 |
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Related tax benefit realized | $ 1 | $ 7 | $ 16 | $ 14 |
Restricted Stock Units (RSUs) | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Share units earned (in shares) | 142 | 0 | 166,197 | 160,200 |
Shares issued net of withholding taxes (in shares) | 102 | 0 | 119,346 | 99,968 |
Related tax benefit realized | $ 0 | $ 0 | $ 2 | $ 3 |