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Financial Instruments and Fair Value Measurements, Summary of available-for-sale debt securities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Available-for-sale debt securities [Abstract]          
Cost $ 432   $ 432   $ 162
Gross unrealized gains     1   0
Gross unrealized losses     0   0
Fair value 433   433   162
Available-for-sale debt securities, additional information [Abstract]          
Allowance for credit losses related to available-for-sale debt securities     0   0
Proceeds from maturities and sales of available-for-sale debt securities and the related gross realized gains and losses [Abstract]          
Proceeds from maturities of available-for-sale debt securities 0 $ 23 0 $ 331  
Proceeds from sales of available-for-sale debt securities 0 180 0 180  
Gross realized gains 0   0    
Gross realized losses 0   0    
Available-for-sale debt securities continuous unrealized loss position [Abstract]          
Unrealized loss on available-for-sale debt securities in continuous unrealized loss position for less than twelve months 0   0   0
Unrealized loss on available-for-sale debt securities in continuous unrealized loss position for greater than twelve months $ 0   $ 0   $ 0
Minimum [Member]          
Proceeds from maturities and sales of available-for-sale debt securities and the related gross realized gains and losses [Abstract]          
Gross realized gains   0   0  
Gross realized losses   0   0  
Maximum [Member]          
Proceeds from maturities and sales of available-for-sale debt securities and the related gross realized gains and losses [Abstract]          
Gross realized gains   1   1  
Gross realized losses   $ 1   $ 1  
Bonds [Member] | Minimum [Member]          
Available-for-sale debt securities, additional information [Abstract]          
Investment maturity period     4 months    
Bonds [Member] | Maximum [Member]          
Available-for-sale debt securities, additional information [Abstract]          
Investment maturity period     39 months