Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets - Goodwill (Details)

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Goodwill and Intangible Assets - Goodwill (Details) (USD $)
3 Months Ended
Mar. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill   $ 6,400,000,000 $ 6,400,000,000
Additional goodwill associated with merger $ 675,000,000