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Investments (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Variable Interest Entity [Line Items]      
RESTRICTED CASH $ 89   $ 214
Borrowings for real estate investments through variable interest entities 0 $ 170  
Distributions to variable interest entities noncontrolling interest 0 107  
Real estate investment through variable interest entity 125 15  
Impairment on equity method investment [Abstract]      
Impairment on equity investments 121 58  
Current assets      
Variable Interest Entity [Line Items]      
VIE assets 2   2
Restricted cash      
Variable Interest Entity [Line Items]      
RESTRICTED CASH 89   214
Property, plant and equipment      
Variable Interest Entity [Line Items]      
VIE assets 266   130
Current liabilities      
Variable Interest Entity [Line Items]      
Current liabilities 7   0
Other long-term liabilities      
Variable Interest Entity [Line Items]      
Other long-term liabilities $ 350   346
Single-asset special purpose entity (SPE) [Member]      
Variable Interest Entity [Line Items]      
Stated interest rate (percentage) 5.612%    
Decrease in restricted cash $ 125 $ 48  
Mortgage note liability [Member]      
Variable Interest Entity [Line Items]      
Other long-term liabilities 341   342
Noncontrolling Interests      
Variable Interest Entity [Line Items]      
Other long-term liabilities $ 9   $ 4