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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Jan. 01, 2013
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Accumulated other comprehensive loss revision for CTA |  |  |  | $ 97
Revision impact |  |  |  | 151
SICAD 2 pre-tax charge | $ 58 |  | $ 58 |
SIMADI pre-tax charge |  | $ 3 |  |
Minimum [Member] |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Marketable securities, maturity timing in months |  | 3 months |  |
Definite-lived intangible assets, useful life |  | 1 year |  |
Asset retirement obligations, useful life |  | 1 year |  |
Minimum [Member] | Equipment and Buildings [Member] |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 15 years |  |
Minimum [Member] | Computer Software, Intangible Asset [Member] |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 5 years |  |
Maximum [Member] |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Marketable securities, maturity timing in months |  | 12 months |  |
Definite-lived intangible assets, useful life |  | 20 years |  |
Asset retirement obligations, useful life |  | 25 years |  |
Maximum [Member] | Equipment and Buildings [Member] |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 25 years |  |
Maximum [Member] | Computer Software, Intangible Asset [Member] |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 7 years |  |
Pension Plan [Member] |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Accumulated other comprehensive loss revision for pension settlement charges |  |  |  | $ 54

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