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Equity (Tables)
12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Changes in Shares of Common Stock
Common Stock
The changes in our shares of common stock,
 
as categorized in the equity section
 
of the balance sheet, were:
Shares
2021
2020
2019
Issued
Beginning of year
1,798,844,267
1,795,652,203
1,791,637,434
Acquisition of Concho
285,928,872
-
-
Distributed under benefit plans
6,789,608
3,192,064
4,014,769
End of year
2,091,562,747
1,798,844,267
1,795,652,203
Held in Treasury
Beginning of year
730,802,089
710,783,814
653,288,213
Repurchase of common stock
58,517,786
20,018,275
57,495,601
End of year
789,319,875
730,802,089
710,783,814