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Investment 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	$ 1,636	$ 1,641	$ 3,251	$ 3,329
Operating expenses	1,229	1,173	2,446	2,408
Operating income	407	468	805	921
Other expense, net	(2)	(3)	(2)	(8)
Net income	$ 405	$ 465	$ 803	$ 913

X

- Definition

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

+ References

No definition available.

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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
-Subparagraph (c)
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-Section 50
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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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- Definition

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

+ References

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-Publisher FASB
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- Definition

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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-Publisher FASB
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