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Fair Value Measurements And Disclosure (Effect Of Derivatives On The Consolidated Statements Of Income) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Fair Value Hedging Relationships [Member] | Interest Rate Swaps [Member] | Interest expense [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on interest rate swaps $ 5 $ (30) $ 71 $ 11
Gain (Loss) on long-term debt (5) 30 (71) (11)
Cash Flow Hedging Relationships [Member] | Cross-Currency Swaps [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) recognized in accumulated OCI (595) (102) (404) (330)
Cash Flow Hedging Relationships [Member] | Interest Rate Locks [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) recognized in accumulated OCI 0 (45) 0 (361)
Interest income (expense) reclassified from accumulated OCI into income $ (14) $ (15) $ (29) $ (26)