v3.21.1
Cash Flow Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash Payments    
Interest $ 233 $ 200
Income taxes 53 465
Net Sales (Purchases) of Investments    
Short-term investments purchased (3,432) (3,423)
Short-term investments sold 2,966 2,606
Investments and Long-term receivables purchased (60) (143)
Investments and Long-term receivables sold 27 25
Net Sales (Purchases) of Investments (499) (935)
Cash acquired from Concho 382 $ 0
Concho Resources Inc [Member]    
Business Acquisition [Line Items]    
Increase (Decrease) in Commodity Contract Assets and Liabilities $ 692