Long-Term Debt, Bridge Loan Commitments and Common Stock (Details) $ / shares in Units, shares in Millions, $ in Millions					3 Months Ended				9 Months Ended
	Nov. 06, 2025 $ / shares	Jul. 01, 2025 USD ($)	May 30, 2025 USD ($)	Apr. 01, 2025 USD ($)	Sep. 30, 2025 USD ($) extension $ / shares	Jun. 30, 2025 $ / shares	Mar. 31, 2025 $ / shares	Sep. 30, 2024 $ / shares	Sep. 30, 2025 USD ($) extension $ / shares shares	Sep. 30, 2024 USD ($) $ / shares	Dec. 31, 2024 USD ($)	Nov. 07, 2024 USD ($)	Nov. 30, 2021 USD ($)
Debt Instrument Table [Line Items]
Long-term debt repayments									$ 1,766.0	$ 0.0
Aggregate principal amount of current and long-term debt					$ 7,640.0				$ 7,640.0		$ 4,640.0
Proceeds from issuance of long-term debt		$ 3,470.0
Debt issuance costs		$ 8.0
Stock repurchase program, authorized amount												$ 10,000.0	$ 5,000.0
Stock repurchased during period, shares | shares									15.4
Stock repurchased during period, value									$ 1,800.0
Stock repurchase program, remaining authorized repurchase amount					$ 4,000.0				4,000.0
Estimated federal excise taxes									$ 17.0
Common stock dividends declared (in USD per share) | $ / shares					$ 0.00		$ 0.975	$ 0.91	$ 2.97	$ 2.73
Subsequent Event
Debt Instrument Table [Line Items]
Common stock dividends declared (in USD per share) | $ / shares	$ 1.02
O 2025 Q2 Dividends One
Debt Instrument Table [Line Items]
Common stock dividends declared (in USD per share) | $ / shares						$ 0.975
O 2025 Q2 Dividends Two
Debt Instrument Table [Line Items]
Common stock dividends declared (in USD per share) | $ / shares						$ 1.02
Line of Credit
Debt Instrument Table [Line Items]
Line of credit facility, maximum borrowing capacity			$ 2,000.0
Debt instrument, term			364 days
Associated fees			$ 6.5
Senior Notes Due 2025
Debt Instrument Table [Line Items]
Long-term debt repayments				$ 500.0
Debt instrument, interest rate (as a percent)				3.15%
4.400% Senior Notes due 2028
Debt Instrument Table [Line Items]
Debt instrument, interest rate (as a percent)		4.40%
Aggregate principal amount of current and long-term debt		$ 500.0
5.000% Senior Notes due 2032
Debt Instrument Table [Line Items]
Debt instrument, interest rate (as a percent)		5.00%
Aggregate principal amount of current and long-term debt		$ 1,250.0
5.350% Senior Notes due 2036
Debt Instrument Table [Line Items]
Debt instrument, interest rate (as a percent)		5.35%
Aggregate principal amount of current and long-term debt		$ 1,250.0
5.950% Senior Notes due 2055
Debt Instrument Table [Line Items]
Debt instrument, interest rate (as a percent)		5.95%
Aggregate principal amount of current and long-term debt		$ 500.0
4.15% Senior Notes Due 2026
Debt Instrument Table [Line Items]
Debt instrument, interest rate (as a percent)					4.15%				4.15%
Aggregate principal amount of current and long-term debt					$ 750.0				$ 750.0
Revolving Credit Agreement | Revolving Credit Facility
Debt Instrument Table [Line Items]
Line of credit facility, maximum borrowing capacity					$ 1,900.0				$ 1,900.0
Line of credit facility, maturity term extensions | extension					2				2
Line of credit facility, extension period					1 year				1 year
Line of credit facility increase additional borrowings (not to exceed)									$ 3,000.0
Maximum total debt to total capitalization ratio allowed under financial covenant					65.00%				65.00%
Revolving Credit Agreement | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR)
Debt Instrument Table [Line Items]
Debt Instrument, basis spread on base rate (as a percent)									0.10%
Weighted average interest rate (in hundredths)									5.13%
Revolving Credit Agreement | Revolving Credit Facility | Base Rate
Debt Instrument Table [Line Items]
Weighted average interest rate (in hundredths)									7.25%