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Compensation Plans (Unvested Restricted Stock Units Activity) (Details) - Restricted Stock Units (RSUs)
9 Months Ended
Sep. 30, 2020
$ / shares
shares
Unvested restricted stock units - number of shares  
Unvested at beginning of period (in shares) | shares 19,394,236
Granted (in shares) | shares 11,635,680
Vested (in shares) | shares (8,437,980)
Forfeited/canceled (in shares) | shares (951,715)
Unvested at end of period (in shares) | shares 21,640,221
Unvested restricted stock units - weighted-average grant-date fair value  
Unvested at beginning of period (in dollars per share) | $ / shares $ 1,055.22
Granted (in dollars per share) | $ / shares 1,394.72
Vested (in dollars per share) | $ / shares 1,071.16
Forfeited/canceled (in dollars per share) | $ / shares 1,150.93
Unvested at end of period (in dollars per share) | $ / shares $ 1,228.65