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Stock-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Stock-based compensation |  |  |  |
Pre-tax compensation expense | $ 12 | $ 10 | $ 42 | $ 26
Long-term stock awards |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | 3 | 3 | 6 | 7
Stock options |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | 1 | 2 | 5 | 5
Restricted stock units |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | 4 | 3 | 23 | 11
Performance Restricted Stock Units |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | 4 | 0 | 6 | 1
Phantom stock awards |  |  |  |
Stock-based compensation |  |  |  |
Pre-tax compensation expense | $ 0 | $ 2 | $ 2 | $ 2

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