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Investments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Investments      
Fair Value $ 1,416 $ 1,465  
Long term investments 156 87  
Change in unrealized gains (losses) on trading securities 12 74 $ 176
Domestic debt securities      
Investments      
Fair Value 542 496  
Domestic equity securities      
Investments      
Fair Value 472 702  
Foreign equity securities      
Investments      
Fair Value 193 133  
Foreign debt securities      
Investments      
Fair Value 133 68  
Foreign debt securities | Denominated in Euros      
Investments      
Fair Value 46 29  
Money market funds held in trading accounts      
Investments      
Fair Value 59 47  
Other trading investments      
Investments      
Fair Value $ 17 $ 19