Long-Term Incentive Plans - Summary of activity related to restricted stock awards (Details) - Restricted stock awards and restricted stock units	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Number of Shares/Units (In millions)
Beginning balance (in shares) | shares	1,700,000
Granted (in shares) | shares	700,000
Vested (in shares) | shares	(200,000)
Forfeited (in shares) | shares	(100,000)
Ending balance (in shares) | shares	2,100,000
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars of shares) | $ / shares	$ 421.58
Granted (in dollars of shares) | $ / shares	633.31
Vested (in dollars of shares) | $ / shares	374.17
Forfeited (in dollars of shares) | $ / shares	440.08
Ending balance (in dollars of shares) | $ / shares	$ 499.85