Accounting Policies and Supplemental Disclosures - Calculation of Diluted Shares (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accounting Policies [Abstract]
Shares used in computation of basic earnings per share (in shares)	10,285	10,175	10,268	10,173
Total dilutive effect of outstanding stock awards (in shares)	164	0	130	0
Shares used in computation of diluted earnings per share (in shares)	10,449	10,175	10,398	10,173