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Share-Based Compensation (Stock Option Activity) (Details) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at the beginning of the period | shares	32
Granted | shares	7
Exercised | shares	(10)
Forfeitures | shares	(1)
Outstanding at the end of the period | shares	28
Exercisable at end of period | shares	13
Vested and expected to vest, end of period | shares	27
Outstanding at beginning of period, Weighted-Average Exercise Price | $ / shares	$ 166
Granted, Weighted-Average Exercise Price | $ / shares	311
Exercised, Weighted-Average Exercise Price | $ / shares	126
Forfeitures, Weighted Average Exercise Price | $ / shares	255
Outstanding at end of period, Weighted-Average Exercise Price | $ / shares	211
Exercisable at end of period, Weighted-Average Exercise Price | $ / shares	150
Vested and expected to vest end of period, Weighted-Average Exercise Price | $ / shares	$ 210
Outstanding at end of period, Weighted Average Remaining Contractual Term (in years)	6 years 6 months 30 days
Exercisable at end of period, Weighted Average Remaining Contractual Term (in years)	5 years
Vested and expected to vest end of period, Weighted Average Remaining Contractual Term (in years)	6 years 6 months
Outstanding at end of period, Aggregate Intrinsic Value | $	$ 3,937
Exercisable at end of period, Aggregate Intrinsic Value | $	2,579
Vested and expected to vest end of period, Aggregate Intrinsic Value | $	$ 3,892

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average price of options that were either forfeited or expired.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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