Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Summary of Significant Accounting Policies New Accounting Pronouncements (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Accounting Standards Update 2015-17 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Tax Assets, Net, Current	$ 257
Deferred Tax Liabilities, Net, Current	$ 33
Long-term Debt [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt Issuance Costs, Net		$ 27