Impairments (Details) (USD $)	3 Months Ended	9 Months Ended
	Dec. 31, 2011	Sep. 30, 2012
Impairment of goodwill and other indefinite Lived intangible assets
Estimated loss on impairment of goodwill	$ 5,200,000,000
Estimate of loss on impairment of goodwill per diluted share	$ 16.15
Adjustment to original estimate of goodwill		118,000,000
Adjustment to original estimate of goodwill, per diluted share		$ 0.33
Customer relationships
Assets held for sale
Aggregate losses on impairment of assets per diluted share		$ 0.10
Impairment of definite-lived intangible assets
Impairment loss on finite-lived intangible asset		53,000,000
Impairment loss on finite-lived intangible asset, continuing operations		37,000,000
Trade name intangible asset
Assets held for sale
Aggregate losses on impairment of assets per diluted share		$ 0.07
Impairment of goodwill and other indefinite Lived intangible assets
Impairment loss on indefinite-lived intangible asset		39,000,000
Impairment loss on indefinite-lived intangible asset, continuing operations, net of tax		$ 25,000,000