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Investments in Unconsolidated Entities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Equity method investments, combined income statements
Revenues	$ 1,630	$ 1,636	$ 3,239	$ 3,318
Operating expenses	1,224	1,168	2,435	2,398
Operating income	406	468	804	920
Other expense, net	(1)	(3)	(1)	(6)
Net income	$ 405	$ 465	$ 803	$ 914

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
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
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X

- Definition

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

+ References

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

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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.

+ References

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- Definition

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

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