v3.20.2
Fair Value Measurements And Disclosure (Effect Of Derivatives On The Consolidated Statements Of Income) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Fair Value Hedging Relationships [Member] | Interest Rate Swaps [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on interest rate swaps $ (14) $ 35 $ (4) $ 59
Gain (Loss) on long-term debt 14 (35) 4 (59)
Cash Flow Hedging Relationships [Member] | Cross-Currency Swaps [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) recognized in accumulated OCI 809 (763) (3,170) (595)
Cash Flow Hedging Relationships [Member] | Interest Rate Locks [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) recognized in accumulated OCI (12) (23) (648) (23)
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 (18) (16) (34) (32)
Cash Flow Hedging Relationships [Member] | Foreign Exchange Contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) recognized in accumulated OCI 2 4 (11) (3)
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) $ 7 $ 13 $ 10