Guarantor Financial Information (Narrative) (Details) (USD $)	3 Months Ended
	Dec. 31, 2011 Bermuda Reorganization Note [Member]	Dec. 31, 2001 Bermuda Reorganization Note [Member]	Mar. 31, 2012 Ireland Reorganization Note [Member]	Sep. 30, 2009 Ireland Reorganization Note [Member]	Mar. 31, 2005 Senior Notes Due in 2015 [Member]	Dec. 31, 2001 Senior Notes Due in 2015 [Member]
Stated interest rate for debt instruments		11.00%				4.75%
Principal amount of notes		$ 3,600,000,000		$ 15,000,000,000	$ 300,000,000
Repayments of Notes payable	1,000,000,000
Settlement of net intercompany payables				4,100,000,000
Amount outstanding			$ 10,800,000,000