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Derivatives and Hedging Activities (Details 1) - Fair Value Hedging [Member] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Other Expense [Member]        
Derivative Instruments, Gains (Losses) [Line Items]        
Fixed-rate long-term debt   $ (37)   $ (8)
Derivatives designated as hedging instruments   20   (30)
Total   $ (17)   $ (38)
Interest Expense [Member]        
Derivative Instruments, Gains (Losses) [Line Items]        
Fixed-rate long-term debt $ 12   $ 127  
Derivatives designated as hedging instruments (20)   (115)  
Total $ (8)   $ 12