v3.26.1
Debt and Credit Agreements - Narrative (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2025
swap
Jun. 30, 2026
USD ($)
swap
Dec. 31, 2023
swap
Dec. 31, 2022
swap
Dec. 31, 2025
USD ($)
Commercial Paper          
Line of Credit Facility          
Line of credit facility capacity   $ 1,000,000,000.0      
Line of credit facility, amount outstanding   0      
Two Separate Fixed-to-Floating Interest Rate Swaps Due 2055 | Fair Value Hedging          
Line of Credit Facility          
Derivative, number of fair value hedges | swap 2        
Derivative, term of contract 10 years        
Two Separate Fixed-to-Floating Interest Rate Swaps Due 2055 | Fair Value Hedging | Designated as Hedging Instrument          
Line of Credit Facility          
Interest rate fair value hedge asset at fair value   $ 4,000,000     $ 9,000,000
Seven Fixed-to-Floating Interest Rate Swaps | Fair Value Hedging          
Line of Credit Facility          
Derivative, number of fair value hedges | swap   7      
Derivative, term of contract   10 years      
Two Separate Fixed-to-Floating Interest Rate Swaps | Fair Value Hedging          
Line of Credit Facility          
Derivative, number of fair value hedges | swap     2    
Five Separate Fixed-to-Floating Interest Rate Swaps | Fair Value Hedging          
Line of Credit Facility          
Derivative, number of fair value hedges | swap       5  
Five Separate Fixed-to-Floating Interest Rate Swaps | Fair Value Hedging | Designated as Hedging Instrument          
Line of Credit Facility          
Interest rate fair value hedge liability at fair value   $ 94,000,000     87,000,000
2023 Fixed-to-Floating Interest Rate Swaps | Fair Value Hedging | Designated as Hedging Instrument          
Line of Credit Facility          
Interest rate fair value hedge asset at fair value   $ 9,000,000     14,000,000
Interest Rate Swap          
Line of Credit Facility          
Derivative instrument, period following debt maturity, hedged transaction   36 months      
Interest Rate Swap | Cash Flow Hedging | Designated as Hedging Instrument          
Line of Credit Facility          
Derivative asset, notional value   $ 500,000,000      
Derivative asset, unsettled notional amount   0     $ 0
Two Separate Fixed-to-Floating Interest Rate Swaps Due 2055          
Line of Credit Facility          
Notional value of hedged notes   250,000,000      
Seven Fixed-to-Floating Interest Rate Swaps          
Line of Credit Facility          
Notional value of hedged notes   1,100,000,000      
3.25% Notes Due 2027          
Line of Credit Facility          
Notional value of hedged notes   $ 850,000,000      
Interest rate   3.25%      
Unsecured Revolving Credit Facility Due 2028 | Revolving Credit Facility          
Line of Credit Facility          
Line of credit facility capacity   $ 1,200,000,000      
Line of credit facility, amount outstanding   $ 0