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Stock based Compensation - RSUs and PBRSUs Summary (Details) - Unvested restricted stock units - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Number of Shares      
Non-vested units as of the beginning of the period (in shares) 9,717 7,341 7,080
Granted (in shares) 4,762 5,048 3,191
Vested (in shares) (3,610) (2,251) (1,863)
Forfeited (in shares) (836) (421) (1,067)
Non-vested units as of the end of the period (in shares) 10,033 9,717 7,341
Weighted Average Grant Date Fair Value      
Non-vested units as of the beginning of the period (in dollars per share) $ 13.07 $ 13.90 $ 11.35
Granted (in dollars per share) 13.02 11.93 16.94
Vested (in dollars per share) 12.21 12.48 15.77
Forfeited (in dollars per share) 11.63 12.06 12.82
Non-vested units as of the end of the period (in dollars per share) $ 13.37 $ 13.07 $ 13.90
Weighted Average Remaining Years and Aggregate Intrinsic Value      
Non-vested units, weighted average remaining years 2 years 1 month 6 days    
Non-vested units, aggregate intrinsic value $ 142.4