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Investments (Equity Securities) (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]          
Equity securities $ 492   $ 492   $ 831
Equity Securities, FV-NI, Unrealized Gain (Loss) (106) $ 25 (276) $ (31)  
Equity securities without readily determinable fair value 280   280   262
Fair Value, Inputs, Level 1 [Member]          
Debt Securities, Available-for-sale [Line Items]          
Equity securities $ 361   $ 361   $ 611