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Description Of Company And Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Intangibles not subject to amortization | $ 11 | $ 11
Period In Years That Unrecognized Actuarial Net Gains (Losses) Are Being Recognized |  | 15 years
Finite lived intangible assets useful lives | 25 years |
Restricted cash and cash equivalents | $ 2 | $ 17
ASU 2015-17 [Member] |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Deferred Tax Assets, Net of Valuation Allowance, Current |  | 90
Deferred Tax Liabilities, Net, Current |  | $ 46

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