Stock Based Incentive Compensation Plans (Summary of activity for stock options with service conditions) (Details) - Stock options with service conditions [Member] $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares
Shares
Outstanding as of beginning of year (in shares) | shares	3,458,959
Granted - original (in shares) | shares	641,517
Exercised (includes shares tendered) (in shares) | shares	(681,122)
Forfeited or expired (in shares) | shares	(407,818)
Outstanding as of end of year (in shares) | shares	3,011,536
Vested or expected to vest as of end of year (in shares) | shares	2,784,239
Exercisable as of end of year (in shares) | shares	1,902,919
Summary of activity for stock options, additional disclosures [Abstract]
Weighted average exercise price as of beginning of year (in dollars per share) | $ / shares	$ 57.64
Weighted average exercise price granted - original (in dollars per share) | $ / shares	54.69
Weighted average exercise price exercised (includes shares tendered) (in dollars per share) | $ / shares	44.24
Weighted average exercise price forfeited or expired (in dollars per share) | $ / shares	63.63
Weighted average exercise price outstanding as of end of year (in dollars per share) | $ / shares	59.23
Weighted average exercise price vested or expected to vest as of end of year (in dollars per share) | $ / shares	59.21
Weighted average exercise price exercisable as of end of year (in dollars per share) | $ / shares	$ 59.75
Weighted average remaining contractual term outstanding as of end of year (in years)	6 years 5 months 8 days
Weighted average remaining contractual term vested or expected to vest as of end of year (in years)	6 years 3 months 18 days
Weighted average remaining contractual term exercisable as of end of year (in years)	5 years 3 months 3 days
Aggregate intrinsic value outstanding as of end of year | $	$ 31
Aggregate intrinsic value vested or expected to vest as of end of year | $	29
Aggregate intrinsic value exercisable as of end of year | $	$ 20