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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
Mar. 31, 2019
Mar. 31, 2018
Fair Value Hedging Relationships [Member] | Interest Rate Swaps [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) on interest rate swaps $ 24 $ (53)
Gain (Loss) on long-term debt (24) 53
Cash Flow Hedging Relationships [Member] | Cross-Currency Swaps [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) recognized in accumulated OCI 168 854
Cash Flow Hedging Relationships [Member] | Interest Rate Locks [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) recognized in accumulated OCI 0 0
Cash Flow Hedging Relationships [Member] | Interest Rate Locks [Member] | Interest expense [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Interest income (expense) reclassified from accumulated OCI into income (16) (15)
Cash Flow Hedging Relationships [Member] | Foreign Exchange Contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) recognized in accumulated OCI (7) 0
Cash Flow Hedging Relationships [Member] | Foreign Exchange Contracts [Member] | Other income expense [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Interest income (expense) reclassified from accumulated OCI into income $ 3 $ 0