Share-Based Payments - Stock Option Activities (Details) - Stock Option Plan $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($) $ / shares shares
Stock option activity, shares
Stock options at the beginning of the period (in shares) \| shares	11,297
Stock options, granted (in shares) \| shares	754
Stock options, exercised (in shares) \| shares	(1,954)
Stock options, forfeited (in shares) \| shares	(866)
Stock options, expired (in shares) \| shares	(98)
Stock options at the end of the period (in shares) \| shares	9,133
Stock options, vested and expected to vest (in shares) \| shares	8,798
Stock options, exercisable (in shares) \| shares	5,711
Weighted-average exercise price per stock option
Stock options, weighted-average strike price at the beginning of the period (in dollars per share) \| $ / shares	$ 53.84
Stock options, weighted-average exercise price, granted (in dollars per share) \| $ / shares	92.56
Stock options, weighted-average exercise price, exercised (in dollars per share) \| $ / shares	45.84
Stock options, weighted-average exercise price, forfeited (in dollars per share) \| $ / shares	65.23
Stock options, weighted-average exercise price, expired (in dollars per share) \| $ / shares	45.15
Stock options, weighted-average strike price at the end of the period (in dollars per share) \| $ / shares	57.77
Stock options, weighted-average exercise price, vested and expected to vest (in dollars per share) \| $ / shares	56.96
Stock options, weighted-average exercise price, exercisable (in dollars per share) \| $ / shares	$ 48.90
Stock options, weighted-average remaining contractual term	7 years 14 days
Stock options, weighted-average remaining contractual term, vested and expected to vest	6 years 11 months 23 days
Stock options, weighted-average remaining contractual term, exercisable	6 years 3 months 3 days
Stock options, aggregate intrinsic value \| $	$ 125
Stock options, aggregate intrinsic value, vested and expected to vest \| $	124
Stock options, aggregate intrinsic value, exercisable \| $	$ 107

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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 exercisable or convertible options. 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 exercisable options that may 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 exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. 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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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 exercise price, at which grantee can acquire shares reserved for issuance, for 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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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. 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 remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. 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 share options (or share units) exercised during the current period.

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