Capital Stock - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Number of Shares
Outstanding at beginning of period (in shares)	2.9
Grants (in shares)	0.6
Exercised (in shares)	(0.2)
Forfeited (in shares)	(0.2)
Outstanding at end of period (in shares)	3.1	2.9
Weighted-Average Option Price per Share
Outstanding at beginning of period (in dollars per share)	$ 361.36
Granted (in dollars per share)	393.99
Exercised (in dollars per share)	218.66
Forfeited or expired (in dollars per share)	439.71
Outstanding at end of period (in dollars per share)	$ 373.90	$ 361.36
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Exercisable at end of period (in shares)	2.0
Exercisable at end of period (in dollars per share)	$ 343.88
Outstanding at end of period, weighted-average remaining contractual life	5 years 7 months 24 days	5 years 6 months 29 days
Exercisable at end of period, weighted-average remaining contractual life	4 years 3 months 29 days
Outstanding at end of period, aggregate intrinsic value	$ 107	$ 166
Exercisable at end of period, aggregate intrinsic value	$ 106

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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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For presentations that combine terminations, 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 or that expired.

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

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

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

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