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Fair Value of Financial Instruments - Estimated Carrying Amounts of Fair Value of Financial Instruments not Carried at Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Liabilities    
Long-term debt, including current portion $ 6,691 $ 9,494
Level 2    
Debt, Long-term and Short-term, Combined Amount [Abstract]    
Long-term debt, including current portion 6,528 7,432
Level 3    
Debt, Long-term and Short-term, Combined Amount [Abstract]    
Long-term debt, including current portion 169 2,307
Carrying Amount    
Assets    
Notes receivable 17 2
Liabilities    
Long-term debt, including current portion 6,591 9,482
Fair Value Measurement    
Assets    
Notes receivable 14 2
Liabilities    
Long-term debt, including current portion $ 6,697 $ 9,739