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Fair Value Measurements And Disclosure (Effect Of Derivatives On The Consolidated Statements Of Income) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value Hedging Relationships [Member] | Interest Rate Swaps [Member] | Interest Expense [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) on interest rate swaps $ (12) $ (68) $ (61)
Gain (Loss) on long-term debt 12 68 61
Cash Flow Hedging [Member] | Cross-Currency Swaps [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) recognized in accumulated Other Comprehensive Income (825) 571 1,061
Cash Flow Hedging [Member] | Interest Rate Locks [Member] | Interest Expense [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Income (expense) reclassified from accumulated Other Comprehensive Income into income (58) (60) (59)
Cash Flow Hedging [Member] | Foreign Exchange Contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) recognized in accumulated Other Comprehensive Income 51 0 0
Cash Flow Hedging [Member] | Foreign Exchange Contracts [Member] | Other Income Expense [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Income (expense) reclassified from accumulated Other Comprehensive Income into income $ 39 $ 0 $ 0