Debt and Credit Agreements - Narrative (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2025 USD ($) swap	Dec. 31, 2025 USD ($) swap	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($) swap	Dec. 31, 2022 swap	Oct. 23, 2025 USD ($)	Mar. 10, 2025 USD ($)	Sep. 18, 2024 USD ($)	Sep. 30, 2023 USD ($)
Debt Instrument [Line Items]
Other operating activities		$ (70,000,000)	$ (75,000,000)	$ (41,000,000)
Commercial Paper
Debt Instrument [Line Items]
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
Debt Instrument [Line Items]
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
Debt Instrument [Line Items]
Interest rate fair value hedge asset at fair value		$ 9,000,000
Seven Fixed-to-Floating Interest Rate Swaps | Fair Value Hedging
Debt Instrument [Line Items]
Derivative, number of fair value hedges | swap		7
Derivative, term of contract		10 years
2023 Fixed-to-Floating Interest Rate Swaps | Fair Value Hedging
Debt Instrument [Line Items]
Derivative, number of fair value hedges | swap				2
2022 Fixed-to-Floating Interest Rate Swap | Fair Value Hedging
Debt Instrument [Line Items]
Derivative, number of fair value hedges | swap					5
2022 Fixed-to-Floating Interest Rate Swap | Fair Value Hedging | Designated as Hedging Instrument
Debt Instrument [Line Items]
Interest rate fair value hedge liability at fair value		$ 87,000,000	123,000,000
Interest Rate Swap | Cash Flow Hedging | Designated as Hedging Instrument
Debt Instrument [Line Items]
Derivative asset, notional value		500,000,000
Notional amount settled			114,000,000	$ 226,000,000
Other operating activities			52,000,000	$ 95,000,000
Derivative asset, unsettled notional amount		0	0
Two Separate Fixed-to-Floating Interest Rate Swaps Due 2033 | Fair Value Hedging | Designated as Hedging Instrument
Debt Instrument [Line Items]
Interest rate fair value hedge asset at fair value		14,000,000	$ 7,000,000
5.05% Notes Due 2035
Debt Instrument [Line Items]
Notional value of hedged notes						$ 300,000,000	$ 600,000,000
Interest rate						5.05%	5.05%
4.90% Notes Due 2055
Debt Instrument [Line Items]
Notional value of hedged notes								$ 550,000,000
Interest rate								4.90%
5.2% Notes Due 2033
Debt Instrument [Line Items]
Notional value of hedged notes									$ 600,000,000
Interest rate									5.20%
Two Separate Fixed-to-Floating Interest Rate Swaps Due 2055
Debt Instrument [Line Items]
Notional value of hedged notes	$ 250,000,000
Seven Fixed-to-Floating Interest Rate Swaps
Debt Instrument [Line Items]
Notional value of hedged notes		1,100,000,000
3.25% Notes Due 2027
Debt Instrument [Line Items]
Notional value of hedged notes		$ 850,000,000
Interest rate		3.25%
Unsecured Revolving Credit Facility Due 2028 | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility capacity		$ 1,200,000,000
Line of credit facility, amount outstanding		$ 0