Accounting Policies and Supplemental Disclosures - Calculation of Diluted Shares (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accounting Policies [Abstract]
Shares used in computation of basic earnings per share (in shares)	10,175	10,103	10,173	10,089
Total dilutive effect of outstanding stock awards (in shares)	0	183	0	187
Shares used in computation of diluted earnings per share (in shares)	10,175	10,286	10,173	10,276