Capital Stock (Share Repurchases) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Equity, Class of Treasury Stock [Line Items]
Shares repurchased	4.8	5.1
Average price per share	$ 478.99	$ 371.46
Aggregate cost	$ 2,316	$ 1,900	$ 2,700
Authorization remaining at the end of each period	$ 1,876	$ 4,192

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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