Divestitures (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Divestitures (Details) [Abstract]
Ownership percentage by the Company	50.00%		50.00%
Fair value portion of investments accounted under the equity method.	$ 900		$ 900
Cash invested by third party in joint venture	900		900
Ownership percentage by third party	50.00%		50.00%
Deconsolidation gain amount, before tax	626	0	626	0
Deconsolidation gain amount, after tax			$ 409

Primary input used to determine fair value of equity investment

No definition available.

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- Definition

Gain on business travel joint venture transaction, after tax

+ References

No definition available.

+ Details

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- Definition

Gain on business travel joint venture, before tax

+ References

No definition available.

+ Details

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- Details

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- Definition

"The percentage of ownership of common stock or equity participation held by third party in the investee accounted for under the equity method of accounting

+ References

No definition available.

+ Details

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ 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 (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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- Definition

Fair value portion of investments accounted under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 25

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6903542&loc=d3e32014-111567

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