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Financial Statement Presentation New Accounting Pronouncement Adopted (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2015 USD ($) integer | Sep. 30, 2014 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 382,000,000 |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | (5,000,000) | $ 0
Other Comprehensive Income (Loss), Effect of Change in Accounting Principle, Net of Taxes | 13,000,000 |
Accounting Standard Update 2014-05 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | (18,000,000) |
Other Comprehensive Income (Loss), Effect of Change in Accounting Principle, Net of Taxes | 13,000,000 |
Other Noncurrent Assets [Member] | Accounting Standard Update 2014-05 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 1,500,000,000 |
Mong Duong Subsidiary [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Number of deliverables in an agreement | integer | 2 |
New Accounting Pronouncement or Change in Accounting Principle, Current Period Disclosures, Revenue Recognized, Amount | $ 0 |

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