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Impairment	9 Months Ended
Impairment	Sep. 30, 2018
Asset Impairment Charges [Abstract]
Impairment	10. Impairment In the third quarter of 2017, we recorded a pre-tax impairment charge of $2,503 million ($550 million after income taxes) to impair the carrying value of our interests in Norway based on an anticipated sale of the asset using Level 3 inputs to determine fair value. The sale was completed in the fourth quarter of 2017.