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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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

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