Contingencies (Schedule of the Reconciliation of Accrued Liability Balances for Probable Contingencies) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015
Loss Contingency Accrual [Roll Forward]
Expense	$ 8us-gaap_LossContingencyAccrualProvision
Pending Litigation [Member] \| CVR Related Liability at Fair Value [Member]
Loss Contingency Accrual [Roll Forward]
Beginning Balance	265
Expense	(9)
Ending Balance	256
Pending Litigation [Member] \| CVR Related Liability for Probably Contingencies [Member]
Loss Contingency Accrual [Roll Forward]
Beginning Balance	29
Expense	(5)
Ending Balance	24
Pending Litigation [Member] \| Legal Matters Where Negative Outcome is Known or Probable [Member]
Loss Contingency Accrual [Roll Forward]
Beginning Balance	125
Expense	15
Cash payments	(92)
Ending Balance	$ 48

Amount of loss contingency liability.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

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Amount of payments made reducing loss contingency liability.

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Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

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