Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Details)

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Fair Value Measurements (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Liabilities:      
Debt, fair value $ 8,378 $ 6,633  
Investment 19 17 $ 612
Pandora      
Assets:      
Pandora investment 0 523  
Pandora | Investee      
Liabilities:      
Investment     $ 480
Level 1      
Liabilities:      
Debt, fair value 0 0  
Level 1 | Pandora      
Assets:      
Pandora investment 0 0  
Level 2      
Liabilities:      
Debt, fair value 8,378 6,633  
Level 2 | Pandora      
Assets:      
Pandora investment 0 523  
Level 3      
Liabilities:      
Debt, fair value 0 0  
Level 3 | Pandora      
Assets:      
Pandora investment $ 0 $ 0