Capital Stock - Summary of Share Repurchases (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Class of Stock Disclosures [Abstract]
Shares repurchased (in shares)	7.4	6.7
Average price per share (in dollars per share)	$ 350.39	$ 435.32
Aggregate cost - excluding excise tax	$ 2,605	$ 2,900	$ 2,698
Authorization remaining at end of year	$ 6,695	$ 9,300

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Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Total cost of shares repurchased divided by the total number of shares repurchased.

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