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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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Fair Value Hedging Relationships [Member] | Interest Rate Swaps [Member] | Interest expense [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on interest rate swaps $ 54 $ (70) $ 65 $ (59)
Gain (Loss) on long-term debt (54) 70 (65) 59
Cash Flow Hedging Relationships [Member] | Cross-Currency Swaps [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) recognized in accumulated OCI (678) 567 (1,008) 418
Cash Flow Hedging Relationships [Member] | Interest Rate Locks [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) recognized in accumulated OCI 0 0 (361) 0
Interest income (expense) reclassified from accumulated OCI into income (17) (11) (43) (33)
Cash Flow Hedging Relationships [Member] | Foreign Exchange Contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) recognized in accumulated OCI $ 0 $ 0 $ 0 $ (2)