Equity (Summary of Activity Related to Stock Options) (Details) - Stock Options - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Shares Under Option
Shares Under Option Outstanding at January 1,	7,042,441
Granted Shares Under Option	477,416
Exercised Shares Under Option	(3,150,217)
Expired Shares Under Option	(75,804)
Forfeited Shares Under Option	(25,745)
Shares Under Option Outstanding at December 31,	4,268,091	7,042,441
Vested and expected to vest at December 31,	4,256,858
Shares Under Option Exercisable at December 31,	3,293,523
Weighted Average Exercise Price
Weighted Average Exercise Price Outstanding at January 1,	$ 40.25
Granted Weighted Average Exercise Price	57.43	$ 47.58	$ 44.65
Exercised Weighted Average Exercise Price	37.69
Expired Weighted Average Exercise Price	40.63
Forfeited Weighted Average Exercise Price	46.28
Weighted Average Exercise Price Outstanding at December 31,	44.02	$ 40.25
Weighted Average Exercise Price Aggregate number of stock options expected to vest at December 31,	43.99
Weighted Average Exercise Price Exercisable at December 31,	$ 41.72
Weighted Average Remaining Contractual Term
Weighted Average Remaining Contractual Term Outstanding at January 1,	5 years 10 days	3 years 11 months 12 days
Weighted Average Remaining Contractual Term Aggregate number of stock options expected to vest at December 31,	5 years 7 days
Weighted Average Remaining Contractual Term Exercisable at December 31,	4 years 10 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value Outstanding at January 1,	$ 47
Aggregate Intrinsic Value Outstanding at December 31,	79	$ 47
Aggregate Intrinsic Value Aggregate number of stock options expected to vest at December 31,	79
Aggregate Intrinsic Value Exercisable at December 31,	$ 68
Sale of Stock, Price Per Share	$ 62.49	$ 46.95