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Sales and Other Operating Revenue (Tables)
9 Months Ended
Sep. 30, 2018
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue [Table Text Block]
Millions of Dollars
Three Months EndedNine Months Ended
September 30September 30
20182017*20182017*
Revenue from contracts with customers$7,5464,63620,83414,428
Revenue from contracts outside the scope of ASC Topic 606
Physical contracts meeting the definition of a derivative1,8972,0505,8776,631
Financial derivative contracts6240(72)
Consolidated sales and other operating revenues$9,4496,68826,75120,987
*Under the modified retrospective approach, prior period amounts have not been adjusted upon adoption of ASC Topic 606.

Millions of Dollars
Three Months EndedNine Months Ended
September 30September 30
20182017*20182017*
Revenue from Outside the Scope of ASC Topic 606
by Segment
Lower 48$1,5341,5634,5474,834
Canada87161374680
Europe and North Africa2763269561,117
Physical contracts meeting the definition of a derivative$1,8972,0505,8776,631
*Under the modified retrospective approach, prior period amounts have not been adjusted upon adoption of ASC Topic 606.

Millions of Dollars
Three Months EndedNine Months Ended
September 30September 30
20182017*20182017*
Revenue from Outside the Scope of ASC Topic 606
by Product
Crude oil$267171843530
Natural gas1,5221,8114,7755,870
Other10868259231
Physical contracts meeting the definition of a derivative$1,8972,0505,8776,631
*Under the modified retrospective approach, prior period amounts have not been adjusted upon adoption of ASC Topic 606.
Contract with Customer, Asset and Liability [Table Text Block]
Millions of Dollars
Contract Liabilities
At January 1, 2018$251
Contractual payments received*81
Revenue recognized(148)
At September 30, 2018$184
Amounts Recognized in the Consolidated Balance Sheet at September 30, 2018
Current liabilities$147
Noncurrent liabilities37
$184
*Includes $14 million and $81 million for the three- and nine-month periods of 2018, respectively.