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Fair Value Measurement (Values of Assets, by Major Category, Measured at Fair Value on a Nonrecurring Basis) (Details) - Fair Value Measurements Nonrecurring [Member] - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value - Net PP&E (held for use) $ 65 $ 472 $ 268
Fair Value - Equity Method Investments   5,574  
Before-Tax Loss - Net PP&E (Held for use) 522 80 287
Before-Tax Loss - Equity method investments   688  
Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value - Net PP&E (held for use) 0 0 0
Fair Value - Equity Method Investments   0  
Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value - Net PP&E (held for use) 0 0 0
Fair Value - Equity Method Investments   5,574  
Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value - Net PP&E (held for use) $ 65 472 $ 268
Fair Value - Equity Method Investments   $ 0