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Debt and Credit Agreements - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
swap
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Jul. 28, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jul. 09, 2020
USD ($)
Commercial Paper                
Line of Credit Facility                
Maximum borrowing capacity of credit facility $ 1,000,000,000     $ 1,000,000,000        
Borrowings outstanding 0     0        
4.1% Notes Due 2032                
Line of Credit Facility                
Debt issued           $ 950,000,000    
Debt interest rate           4.10%    
4.5% Notes Due 2052                
Line of Credit Facility                
Debt issued           $ 900,000,000    
Debt interest rate           4.50%    
4.65% Notes Due 2068                
Line of Credit Facility                
Debt issued           $ 150,000,000    
Debt interest rate           4.65%    
Fixed Rate Notes Due Between 2036 and 2040                
Line of Credit Facility                
Debt issued 800,000,000 $ 800,000,000   800,000,000        
3.25% Notes Due 2027                
Line of Credit Facility                
Debt issued               $ 850,000,000
Debt interest rate               3.25%
Unsecured Revolving Credit Facility Expiring March 2024 | Credit Facility                
Line of Credit Facility                
Maximum borrowing capacity of credit facility 1,200,000,000     1,200,000,000        
Borrowings outstanding 0     0        
Fixed-to-Floating Interest Rate Swap | Fair Value Hedging                
Line of Credit Facility                
Derivative, number of fair value hedges | swap   5            
Derivative, term of contract   10 years            
Designated as Hedging Instrument | Fixed-to-Floating Interest Rate Swap | Fair Value Hedging                
Line of Credit Facility                
Fair value hedge derivative instrument liabilities at fair value 120,000,000     120,000,000        
Designated as Hedging Instrument | Forward Starting Interest Rate Swap | Cash Flow Hedge                
Line of Credit Facility                
Aggregate notional value of interest forward interest rate swap 173,000,000     173,000,000     $ 91,000,000 $ 500,000,000
Cash flow hedge derivative instrument assets at fair value 173,000,000     173,000,000     $ 91,000,000  
Unrealized gains (losses) recorded net of tax in other comprehensive income related to hedge $ 9,000,000   $ 7,000,000 $ 63,000,000 $ 28,000,000