Stock Incentive Plans - Restricted Stock Activity (Details) - Restricted Stock Units and Performance Share Units shares in Thousands	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Units
Unvested at beginning of period (in shares) | shares	11,005
Granted (in shares) | shares	7,644
Vested (in shares) | shares	(4,216)
Forfeited (in shares) | shares	(1,308)
Unvested at end of period (in shares) | shares	13,125
Weighted average grant date fair value (in dollars per share)
Unvested at beginning of year (in dollars per share) | $ / shares	$ 76.18
Granted (in dollars per share) | $ / shares	54.34
Vested (in dollars per share) | $ / shares	62.59
Forfeited (in dollars per share) | $ / shares	58.73
Unvested at end of year (in dollars per share) | $ / shares	$ 61.57