The accompanying unaudited interim financial statements and notes of Devon have been prepared pursuant to the rules and regulations of the SEC. Pursuant to such rules and regulations, certain disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been omitted. The accompanying unaudited interim financial statements and notes should be read in conjunction with the financial statements and notes included in Devon’s 2019 Annual Report on Form 10-K.

The accompanying unaudited interim financial statements in this report reflect all adjustments that are, in the opinion of management, necessary for a fair statement of Devon’s results of operations and cash flows for the three-month periods ended March 31, 2020 and 2019 and Devon’s financial position as of March 31, 2020. As further discussed in Note 17, Devon reached an agreement to sell its Barnett Shale assets in December 2019, which was amended in April 2020, and sold its Canadian operations on June 27, 2019. Activity relating to Devon’s Barnett Shale assets, inclusive of properties divested as partial sales of the Barnett Shale common operating field in previous reporting periods located primarily in Johnson and Wise counties, Texas, and its Canadian operations are classified as discontinued operations within Devon’s consolidated statements of comprehensive earnings and consolidated statements of cash flows. The associated assets and liabilities of Devon’s Barnett Shale assets and Canadian operations are presented as assets and liabilities associated with discontinued operations on the consolidated balance sheets.

During the fourth quarter of 2019, Devon entered into an agreement to form Cotton Draw Midstream, L.L.C. (“CDM”), a joint-venture entity in the Delaware Basin with an affiliate of QL Capital Partners, LP (“QLCP”). Devon holds a controlling interest in CDM and the portions of CDM’s net earnings and equity not attributable to Devon’s controlling interest are shown separately as noncontrolling interests in the accompanying consolidated statements of comprehensive earnings and consolidated balance sheets. CDM is considered a VIE to Devon. The assets of CDM cannot be used by Devon for general corporate purposes and are included in and disclosed parenthetically on Devon's consolidated balance sheets. The carrying amount of liabilities related to CDM for which the creditors do not have recourse to Devon's assets are also included in, and disclosed parenthetically, on Devon's consolidated balance sheets if material.

The following table presents revenue from contracts with customers that are disaggregated based on the type of good or service.

	Three Months Ended March 31,
	2020		2019
Oil	$	662	$	659
Gas		70		138
NGL		75		122
Oil, gas and NGL revenues from contracts with customers		807		919
Oil, gas and NGL derivatives		720		(605	)
Upstream revenues		1,527		314

Oil		329		356
Gas		92		218
NGL		137		191
Total marketing revenues		558		765
Midstream revenues		2		—
Total marketing and midstream revenues from contracts with customers		560		765
Total revenues	$	2,087	$	1,079

In 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses. This ASU changes the impairment model for trade receivables, held-to-maturity debt securities, net investments in leases, loans and other financial assets measured at amortized cost from the current “incurred loss” model to a new forward-looking “expected loss” model. Devon adopted this ASU in the first quarter of 2020 using the modified retrospective approach. Devon assesses credit risk by class of account type which includes cash equivalents and oil and gas, marketing and midstream, joint interest and other accounts receivable. These classes are then further evaluated using a probability weighted scenario assessment based on historical losses and a probability of future default. This evaluation is supported by an assessment of risk factors such as the age of receivable, current macro-economic conditions, credit rating of the counterparty and our historical loss rate. This adoption did not have a material impact on Devon’s consolidated financial statements.