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Investment 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	$ 1,596	$ 1,679	$ 4,848	$ 5,008
Operating expenses	1,184	1,254	3,631	3,662
Operating income	412	425	1,217	1,346
Other expense, net	(2)	(2)	(4)	(10)
Net income	$ 410	$ 423	$ 1,213	$ 1,336

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

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)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760

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X

- Definition

The amount of gross profit (loss) 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 205
-SubTopic 20
-Section 50
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-Publisher FASB
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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
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
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-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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