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Hedging Activities and Fair Value Measurements, Other Fair Value Measurements (Details) - USD ($)
$ in Billions
Mar. 31, 2022
Dec. 31, 2021
Carrying Value [Member]    
Financial Liabilities: [Abstract]    
Fixed Rate Debt Principal Amount Fair Value Disclosure $ 28.2 $ 29.6
Level 2 [Member] | Fair Value [Member]    
Financial Liabilities: [Abstract]    
Fixed Rate Debt Principal Amount Fair Value Disclosure $ 28.9 $ 33.5