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Acquisition of Business (Details) - Cruise [Member] - USD ($) $ in Millions | 6 Months Ended |
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Jun. 30, 2016 | May 12, 2016
Business Acquisition [Line Items] |  |
Effective Date of Acquisition | May 12, 2016 |
Percentage of Voting Interests Acquired |  | 100.00%
Aggregate Consideration for Acquisitions | $ 581 |
Gross Cash Paid for Acquisitions | 291 |
GMNA [Member] |  |
Business Acquisition [Line Items] |  |
Intangible Assets Acquired with Indefinite Life |  | $ 130
Deferred Tax Liabilities Acquired, Net of Other Assets |  | 39
Goodwill Resulting from the Acquisition |  | $ 490
Common Stock [Member] |  |
Business Acquisition [Line Items] |  |
Consideration for Acquisitions, Common Stock Issued | $ 290 |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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