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Benefit Plans (Changes in Benefit Obligations of Postemployment Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Accrued postemployment costs at beginning of year	$ 65	$ 149
Service cost	1mo_PostemploymentBenefitsServiceCost	1mo_PostemploymentBenefitsServiceCost	1mo_PostemploymentBenefitsServiceCost
Interest cost	1mo_PostemploymentBenefitsInterestCost	1mo_PostemploymentBenefitsInterestCost	1mo_PostemploymentBenefitsInterestCost
Benefits paid	(30)mo_PostemploymentBenefitsBenefitsPaid	(65)mo_PostemploymentBenefitsBenefitsPaid
Actuarial (gains) losses and assumption changes	30	(4)
Other	2mo_PostemploymentBenefitsOtherCost	(17)mo_PostemploymentBenefitsOtherCost	(7)mo_PostemploymentBenefitsOtherCost
Accrued postemployment costs at end of year	$ 69	$ 65	$ 149

The carrying amount as of the balance sheet date of the obligations recognized for the various benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement.

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