Contingencies (Schedule of Reconciliation of the Beginning and Ending Liability Balances in Connection with Probable Contingencies) (Details) - Pending Litigation [Member] $ in Millions	3 Months Ended
Mar. 31, 2017 USD ($)
CVR Related Liability at Fair Value [Member]
Loss Contingency Accrual [Roll Forward]
Beginning Balance	$ 252
Expense (income)	6
Cash payments
Ending Balance	258
Other Probable Contingencies [Member]
Loss Contingency Accrual [Roll Forward]
Beginning Balance	14
Expense (income)
Cash payments	(1)
Ending Balance	$ 13

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 cash outflow 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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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