10-Q Capital Stock (Summary of Share Repurchases) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended					9 Months Ended		12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Equity, Class of Treasury Stock [Line Items]
Shares repurchased						3.8	3.7	4.8	5.1
Average price per share						$ 462.42	$ 473.36	$ 478.99	$ 371.46
Aggregate cost	$ 485	$ 652	$ 579	$ 624	$ 545	$ 1,748	$ 1,748	$ 2,316	$ 1,900	$ 2,700
Authorization remaining at the end of the period	$ 5,128		$ 2,444			$ 5,128	$ 2,444	$ 1,876	$ 4,192