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Investment in Unconsolidated Entities - Schedule of Investments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract]
Equity method investments	$ 481		$ 481		$ 435
Measurement alternative method investments	19		19		18
Total investments in unconsolidated entities	500	$ 467	500	$ 467	$ 453
Equity method investments, combined income statements
Revenues	1,699	1,596	5,023	4,848
Operating expenses	1,234	1,184	3,651	3,631
Operating income	465	412	1,372	1,217
Other income (expense), net	(3)	(2)	(3)	(4)
Net income	$ 462	$ 410	$ 1,369	$ 1,213

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The amount other, nonoperating income (loss) reported by an equity method investment of the entity.

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The amount of the cost of sales reported by an equity method investment of the entity.

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The amount of net income (loss) reported by an equity method investment of the entity.

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