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Change in Accounting Principles (Tables)
9 Months Ended
Sep. 30, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
The cumulative effect of the changes made to our consolidated balance sheet at January 1, 2018, for the
adoption of ASC Topic 606 and ASU No. 2016-01 were as follows:
Millions of Dollars
December 31ASC Topic 606ASU No. 2016-01January 1
2017AdjustmentsAdjustments2018
Liabilities
Other accruals$1,029104-1,133
Total current liabilities9,397104-9,501
Deferred income taxes5,282(31)-5,251
Other liabilities and deferred credits1,269147-1,416
Total liabilities42,561220-42,781
Equity
Accumulated other comprehensive loss$(5,518)-58(5,460)
Retained earnings29,391(220)(58)29,113
Total common stockholders' equity30,607(220)-30,387
Total equity30,801(220)-30,581
For discussion of adjustments for ASU No. 2016-01 and ASC Topic 606, see Note 7Investment in Cenovus Energy and Note 20—Sales and
Other Operating Revenues, respectively.

The effect of the retrospective presentation change related to the net periodic benefit cost of our defined benefit
pension and other postretirement employee benefits plans on our consolidated income statement was as
follows:
Millions of Dollars
PreviouslyEffect of Change As
ReportedHigher/(Lower)Revised
Three Months Ended September 30, 2017
Production and operating expenses$1,224(2)1,222
Selling, general and administrative expenses132(22)110
Exploration expenses75(2)73
Other expenses512677
Nine Months Ended September 30, 2017
Production and operating expenses$3,849(11)3,838
Selling, general and administrative expenses423(121)302
Exploration expenses724(4)720
Other expenses285136421