Subsequent Events (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2012
Subsequent Events (Textuals) [Abstract]
Early redemption premium	$ 14
Extinguishment of Debt, Amount	$ 550

The cash outflow for incremental, external costs directly pertaining to an early extinguishment of debt, including legal costs and prepayment penalties, and excluding interest and repayment of debt principal.

No definition available.

Name:	us-gaap_PaymentsOfDebtExtinguishmentCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration