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Acquisitions and Dispositions - Dispositions (Details) - Non-core assets
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
Held for sale | Depreciation and amortization  
Dispositions  
Impairment losses related to non-core asset sales $ 50
Impairment of goodwill included in disposal group classified as held for sale 15
Held for sale | Other current assets  
Dispositions  
Assets classified as held for sale 120
Disposed of by sale | Depreciation and amortization  
Dispositions  
Gain on sales of non-core assets $ 56