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Fair Value of Financial Assets and Liabilities - Nonrecurring (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Goodwill impairment $ 284 $ 0  
Fair Value, Measurements, Nonrecurring [Member] | Carrying Amount [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Assets held for sale 0   $ 15
Long-term debt 1,496   1,512
Liabilities held for sale 0   40
Fair Value, Measurements, Nonrecurring [Member] | Fair Value [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Assets held for sale 0   15
Long-term debt 1,478   1,463
Liabilities held for sale $ 0   $ 40