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Derivative Instruments, Hedging Activities and Fair Value Measurements, Other Fair Value Measurements (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Carrying Value [Member]    
Financial Liabilities: [Abstract]    
Fixed Rate Debt Principal Amount Fair Value Disclosure $ 25,450 $ 26,150
Level 2 [Member] | Fair Value [Member]    
Financial Liabilities: [Abstract]    
Fixed Rate Debt Principal Amount Fair Value Disclosure $ 26,820 $ 25,970