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Stock-Based Compensation - Deferred Stock Units (DSUs) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Stock-Based Compensation |  |  |
Participant right to receive common stock at end of deferral period (in shares) | 1 |  |
DSUs |  |  |
Units |  |  |
Balance outstanding at the beginning of the period (in shares) | 418,014 |  |
Granted (in shares) | 79,072 |  |
Converted to Common Stock (in shares) | (53,799) |  |
Balance outstanding at the end of the period (in shares) | 443,287 | 418,014 |
Weighted Average Grant Date Fair Value per Unit |  |  |
Balance outstanding at the beginning of the period, (in usd per share) | $ 27.63 |  |
Granted (in usd per share) | 34.40 | $ 45.49 | $ 32.27
Vested (in usd per share) | 25.11 |  |
Balance outstanding at the end of the period (in usd per share) | $ 29.07 | $ 27.63 |
Aggregate intrinsic value for DSUs outstanding | $ 23 | $ 13 | $ 17
Aggregate intrinsic values for DSUs converted to common stock during the period | $ 3 | $ 1 | $ 1
Weighted average grant date fair value (in usd per share) | $ 34.40 | $ 45.49 | $ 32.27

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