Contingencies (Schedule of the Reconciliation of Accrued Liability Balances for Probable Contingencies) (Details) (USD $) In Millions, unless otherwise specified				3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 CVR Related Liability at Fair Value [Member]	Mar. 31, 2014 Pending Litigation [Member] CVR Related Liability at Fair Value [Member]	Mar. 31, 2014 Pending Litigation [Member] Legal Matters Where Negative Outcome is Known or Probable [Member]
Loss Contingency Accrual [Roll Forward]
Beginning Balance	$ 169	$ 119	$ 42		$ 119
Assumed liabilities for HMA contingencies				42	6
Expense					3
Cash payments					(1)
Ending Balance	$ 169	$ 119	$ 42	$ 42	$ 127