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Financial Statement Presentation New Accounting Pronouncement Adopted (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015
Accounting Standard Update 2015-02 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 0 |
Other Current Assets [Member] | Accounting Standard Update 2015-03 [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 |  | $ 24
Other Noncurrent Assets [Member] | Accounting Standard Update 2015-03 [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 |  | 357
Line of Credit [Member] | Other Current Assets [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Deferred Finance Costs, Current, Net |  | 1
Line of Credit [Member] | Other Noncurrent Assets [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Deferred Finance Costs, Noncurrent, Net |  | $ 23

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