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Accounting Policies - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Debt Instrument [Line Items] |  |
Other liabilities | $ 766 | $ 800
Adjustment for Reclassifying Issuance Costs Other Assets to Long Term Debt | Long term debt |  |
Debt Instrument [Line Items] |  |
Debt Issuance Costs, Net |  | (15)
Adjustment for Reclassifying Issuance Costs Other Assets to Long Term Debt | Other assets |  |
Debt Instrument [Line Items] |  |
Debt Issuance Costs, Net |  | 15
Adjustment for Reclassifying Issuance costs from Other Assets to Notes Payable | Other assets |  |
Debt Instrument [Line Items] |  |
Debt Issuance Costs, Net |  | 1
Adjustment for Reclassifying Issuance costs from Other Assets to Notes Payable | Notes payable |  |
Debt Instrument [Line Items] |  |
Debt Issuance Costs, Net |  | $ (1)
Restatement Adjustment |  |
Debt Instrument [Line Items] |  |
Accrued Liabilities | 102 |
Other liabilities | $ 102 |

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