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Hedging Activities and Fair Value Measurements, Other Fair Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Carrying Value [Member]    
Financial Liabilities: [Abstract]    
Fixed-rate debt obligations $ 29,900 $ 27,150
Level 2 [Member] | Fair Value [Member]    
Financial Liabilities: [Abstract]    
Fixed-rate debt obligations $ 35,000 $ 30,370