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Stock-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Stock-based compensation |  |  |  |
Pre-tax compensation expense | $ 10 | $ 8 | $ 26 | $ 16
Long-term stock awards |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | 3 | 5 | 7 | 10
Stock options |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | 2 | 1 | 5 | 2
Restricted stock units |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | 3 | 0 | 11 | 0
Performance Restricted Stock Units |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | 0 | 1 | 1 | 2
Phantom stock awards and stock appreciation rights |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | $ 2 | $ 1 | $ 2 | $ 2

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