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Revenue Impact of Adoption (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Rental income	$ 349	$ 277	$ 298
Contract with Customer, Liability	$ 105
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	25 years
Contract with Customer, Liability, Change in Timeframe, Performance Obligation Satisfied, Revenue Recognized	$ (1)
Revenue from Contract with Customer, Excluding Assessed Tax	5,007
Rental cost of sales	135	62	$ 57
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Rental income	65
Rental cost of sales	65
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Third Party Reimbursements [Member]
Rental income	65
Cost of Goods and Services Sold	369
Revenue from Contract with Customer, Excluding Assessed Tax	369
Rental cost of sales	65
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Non-cash Consideration [Member]
Cost of Goods and Services Sold	50
Sales Revenue Services, Product Related	52
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Percent-of-Proceeds [Member]
Sales Revenue Services, Product Related	146
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Imbalances [Member]
Cost of Goods and Services Sold	55
Revenue from Contract with Customer, Excluding Assessed Tax	55
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Service Oil Allowances [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	7
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties	7
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Oil Allowances [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	7
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties	7
Inventories [Member] | Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 2	$ 1

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