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Benefit Plans Contributions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	3 Months Ended		12 Months Ended
	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2015
Other Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Defined Benefit Plan, Contributions by Employer	$ 250us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPensionPlansDefinedBenefitMember
Supplemental Employee Retirement Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Contributions by Employer		16us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember	16us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Scenario, Forecast [Member] | Other Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Defined Benefit Plan, Contributions by Employer				$ 275us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPensionPlansDefinedBenefitMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

X

- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(3)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

+ Details

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