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Basis of Presentation and Summary of Significant Accounting Policies (Narrative, Recent Financial Accounting Standards) (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Current deferred tax assets | $ 0 |  | $ (22)
Current deferred tax liabilities | $ 0 |  | $ (1,066)
New accounting pronouncement, early adoption, effect |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Current deferred tax assets |  | $ 20 |
Current deferred tax liabilities |  | $ 1,100 |

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