v2.4.0.6
Parent Company (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash payments for interest $ 5,213 $ 6,835 $ 5,891
Parent Company
     
Cash payments for interest 4,254 4,617 4,801
Cash payments for income taxes (13) 57 556
Warrant [Member] | Parent Company
     
Guarantees 8,900 6,900  
Capital Lease Obligations [Member] | Parent Company
     
Guarantees $ 1,400 $ 1,400