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Stock-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Stock-based compensation |  |  |  |
Pre-tax compensation expense | $ 9 | $ 8 | $ 35 | $ 24
Long-term stock awards |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | 4 | 6 | 11 | 16
Stock options |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | 1 | 1 | 6 | 3
Restricted stock units |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | 1 | 0 | 12 | 0
Performance Restricted Stock Units |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | 2 | 0 | 3 | 2
Phantom stock awards and stock appreciation rights |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | $ 1 | $ 1 | $ 3 | $ 3

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