Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets - Intangible Assets (Details)

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Goodwill and Intangible Assets - Intangible Assets (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract]          
Gross carrying amount of intangible assets with definite lives $ 3,100,000,000   $ 3,100,000,000   $ 3,100,000,000
Accumulated amortization of intangible assets with definite lives 1,100,000,000   1,100,000,000   900,000,000
Carrying amount of intangible assets with indefinite lives 1,500,000,000   1,500,000,000   1,500,000,000
Amortization expense $ 77,000,000 $ 77,000,000 $ 154,000,000 $ 154,000,000