Share-Based Compensation (Stock Option Activity) (Details) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at the beginning of the period | shares	28
Granted | shares	5
Exercised | shares	(7)
Forfeitures | shares	(1)
Outstanding at the end of the period | shares	25
Exercisable at end of period | shares	12
Vested and expected to vest, end of period | shares	25
Outstanding at beginning of period, Weighted-Average Exercise Price | $ / shares	$ 211
Granted, Weighted-Average Exercise Price | $ / shares	329
Exercised, Weighted-Average Exercise Price | $ / shares	175
Forfeitures, Weighted Average Exercise Price | $ / shares	297
Outstanding at end of period, Weighted-Average Exercise Price | $ / shares	241
Exercisable at end of period, Weighted-Average Exercise Price | $ / shares	179
Vested and expected to vest end of period, Weighted-Average Exercise Price | $ / shares	$ 240
Outstanding at end of period, Weighted Average Remaining Contractual Term (in years)	6 years 3 months 18 days
Exercisable at end of period, Weighted Average Remaining Contractual Term (in years)	4 years 8 months 12 days
Vested and expected to vest end of period, Weighted Average Remaining Contractual Term (in years)	6 years 2 months 13 days
Outstanding at end of period, Aggregate Intrinsic Value | $	$ 6,610
Exercisable at end of period, Aggregate Intrinsic Value | $	3,932
Vested and expected to vest end of period, Aggregate Intrinsic Value | $	$ 6,509