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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Impact of Accounting Policy Change (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jan. 02, 2011
Change in Accounting Principle [Line Items] |  |  |  |
Change in Accounting Principle, Effect of Change on Net Income From Noncontrolling Interest |  |  | $ 4 |
Impact change in accounting principle [Member] |  |  |  |
Change in Accounting Principle [Line Items] |  |  |  |
Change in Accounting Principle Effect of Change on Basic Earnings Per Share from Continuing Operations | $ 0.02 | $ (0.02) | $ 0.08 |
Change in Accounting Principle, Effect of Change on Diluted Earnings Per Share from Continuing Operations | $ 0.02 | $ (0.02) | $ 0.08 |
Change in accounting principle, cumulative effect on inventory |  |  |  | 91
Change in accounting principle, cumulative effect on stockholder's equity |  |  |  | $ 45

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