v3.19.3.a.u2
Fair Value Measurements And Disclosure (Effect Of Derivatives On The Consolidated Statements Of Income) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 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 $ 58 $ (12) $ (68)
Gain (Loss) on long-term debt (58) 12 68
Cash Flow Hedging [Member] | Cross-Currency Swaps [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) recognized in accumulated Other Comprehensive Income (1,066) (825) 571
Cash Flow Hedging [Member] | Interest Rate Locks [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) recognized in accumulated Other Comprehensive Income (84) 0 0
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 (63) (58) (60)
Cash Flow Hedging [Member] | Foreign Exchange Contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) recognized in accumulated Other Comprehensive Income 10 51 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 $ 6 $ 39 $ 0