Accounting Policies - Narrative (Details) $ in Millions	3 Months Ended
	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)