Share-based Compensation (Equity-Based Compensation Expense) (Details) - USD ($) $ in Millions |
3 Months Ended | |
---|---|---|
Mar. 31, 2019 |
Mar. 31, 2018 |
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Total share-based compensation expense | $ 30 | $ 15 |
Tax benefit recognized | 3 | 3 |
PRSUs | ||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Total share-based compensation expense | 10 | 2 |
RSUs | ||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Total share-based compensation expense | 6 | 7 |
Stock options | ||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Total share-based compensation expense | 9 | 5 |
SARs | ||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Total share-based compensation expense | $ 5 | $ 1 |