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Accounting Policies - Narrative (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2016 USD ($)
Adjustment for Reclassifying Issuance Costs Other Assets to Long Term Debt | Long term debt |
Debt Instrument [Line Items] |
Reclassification of issuance costs | $ (15)
Adjustment for Reclassifying Issuance Costs Other Assets to Long Term Debt | Other assets |
Debt Instrument [Line Items] |
Reclassification of issuance costs | 15
Adjustment for Reclassifying Issuance costs from Other Assets to Notes Payable | Other assets |
Debt Instrument [Line Items] |
Reclassification of issuance costs | 1
Adjustment for Reclassifying Issuance costs from Other Assets to Notes Payable | Notes payable |
Debt Instrument [Line Items] |
Reclassification of issuance costs | $ (1)

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