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Investment in Unconsolidated Entities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Equity and measurement alternative method investments
Equity method investments	$ 469		$ 435
Measurement alternative method investments	19		18
Total investments in unconsolidated entities	488	$ 472	$ 453
Equity method investments, combined income statements
Revenues	1,663	1,615
Operating expenses	1,213	1,217
Operating income	450	398
Other expense, net	(1)
Net income	$ 449	$ 398

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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- Definition

Amount of investment in equity security without readily determinable fair value.

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- 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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-SubTopic 10
-Section 50
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- Definition

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

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- Definition

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

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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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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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