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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Fair Value Hedging Relationships [Member] | Interest Rate Swaps [Member] | Interest expense [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on interest rate swaps $ 2 $ (3) $ (60) $ (51)
Gain (Loss) on long-term debt (2) 3 60 51
Cash Flow Hedging Relationships [Member] | Cross-Currency Swaps [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) recognized in accumulated OCI (13) 429 308 (268)
Cash Flow Hedging Relationships [Member] | Interest Rate Locks [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) recognized in accumulated OCI 0 79 0 0
Interest income (expense) reclassified from accumulated OCI into income (15) (15) (44) (44)
Cash Flow Hedging Relationships [Member] | Foreign Exchange Contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) recognized in accumulated OCI $ 17 $ 0 $ 17 $ 0