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Investments in Unconsolidated Entities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Equity method investments, combined income statements
Revenues	$ 1,590	$ 1,674	$ 4,830	$ 4,992
Operating expenses	1,180	1,249	3,615	3,647
Operating income	410	425	1,215	1,345
Other expense, net		(2)	(2)	(9)
Net income	$ 410	$ 423	$ 1,213	$ 1,336

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The amount of gross profit (loss) reported by an equity method investment of the entity.

+ References

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The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.

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

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