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Revenue Recognition
9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Revenue Recognition Revenue Recognition
The Company recognizes revenue when control of the promised goods or services is transferred to customers at an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.
Disaggregated revenue from contracts with purchasers. Revenues on sales of oil, NGLs, gas and purchased oil, gas and diesel are recognized when control of the product is transferred to the purchaser and payment can be reasonably assured. Sales prices for oil, NGLs, gas and diesel are negotiated based on factors normally considered in the industry, such as an index or spot price, distance from the well to the pipeline or market, commodity quality and prevailing supply and demand conditions. Accordingly, the prices received by the Company for oil, NGLs, gas and diesel sales generally fluctuate similar to changes in the relevant market index prices.
Disaggregated revenue from contracts with purchasers by product type is as follows:
 Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
 (in millions)
Oil sales$2,477 $724 $6,043 $2,101 
NGL sales515 129 1,135 344 
Gas sales290 69 609 172 
Total oil and gas revenues3,282 922 7,787 2,617 
Sales of purchased oil1,642 934 4,422 2,373 
Sales of purchased gas22 38 18 
Sales of purchased diesel 15 — 47 — 
Total sales of purchased commodities1,679 935 4,507 2,391 
Total revenue from contracts with purchasers$4,961 $1,857 $12,294 $5,008 
As of September 30, 2021 and December 31, 2020, the accounts receivable balance representing amounts due or billable under the terms of contracts with purchasers was $1.6 billion and $661 million, respectively.