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Fair Value Measurements And Disclosure (Effect Of Derivatives On The Consolidated Statements Of Income) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Fair Value Hedging Relationships [Member] | Interest Rate Swaps [Member] | Interest expense [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on interest rate swaps $ (70) $ 9 $ (59) $ (78)
Gain (Loss) on long-term debt 70 (9) 59 78
Cash Flow Hedging Relationships [Member] | Cross-Currency Swaps [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) recognized in accumulated OCI 567 482 418 807
Cash Flow Hedging Relationships [Member] | Interest Rate Locks [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Interest income (expense) reclassified from accumulated OCI into income (11) (11) (33) (34)
Cash Flow Hedging Relationships [Member] | Foreign Exchange Contracts [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) recognized in accumulated OCI $ 0 $ 5 $ (2) $ 5