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Investments in Unconsolidated Entities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Equity method investments, combined income statements
Revenues	$ 1,636	$ 1,721	$ 3,318	$ 3,451
Operating expenses	1,168	1,277	2,398	2,564
Operating income	468	444	920	887
Other income (expense), net	(3)	(10)	(6)	(5)
Net income	$ 465	$ 434	$ 914	$ 882

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
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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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- Definition

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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