Debt - Schedule of Principal Amount, Effective Interest Rate and Maturity Date for Corporation's Senior Notes (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2024	Nov. 04, 2024
7% Debentures, Due 2025
Debt Instrument [Line Items]
Principal Amount	$ 125,000,000
Effective Interest Rate	7.05%
Maturity Date	Dec. 01, 2025
3.450% Senior Notes, Due 2027
Debt Instrument [Line Items]
Principal Amount	$ 300,000,000
Effective Interest Rate	3.55%
Maturity Date	Jun. 01, 2027
3.500% Senior Notes, Due 2027
Debt Instrument [Line Items]
Principal Amount	$ 495,000,000
Effective Interest Rate	3.61%
Maturity Date	Dec. 15, 2027
2.500% Senior Notes, Due 2030
Debt Instrument [Line Items]
Principal Amount	$ 478,000,000
Effective Interest Rate	2.71%
Maturity Date	Mar. 15, 2030
2.400% Senior Notes, Due 2031
Debt Instrument [Line Items]
Principal Amount	$ 896,000,000
Effective Interest Rate	2.48%
Maturity Date	Jul. 15, 2031
5.150% Senior Notes, Due 2034
Debt Instrument [Line Items]
Principal Amount	$ 750,000,000	$ 750,000,000
Effective Interest Rate	5.33%
Maturity Date	Dec. 01, 2034
6.25% Senior Notes, Due 2037
Debt Instrument [Line Items]
Principal Amount	$ 230,000,000
Effective Interest Rate	6.32%
Maturity Date	May 01, 2037
4.250% Senior Notes, Due 2047
Debt Instrument [Line Items]
Principal Amount	$ 598,000,000
Effective Interest Rate	4.32%
Maturity Date	Dec. 15, 2047
3.200% Senior Notes, Due 2051
Debt Instrument [Line Items]
Principal Amount	$ 866,000,000
Effective Interest Rate	3.29%
Maturity Date	Jul. 15, 2051
5.500% Senior Notes, Due 2054
Debt Instrument [Line Items]
Principal Amount	$ 750,000,000	$ 750,000,000
Effective Interest Rate	5.70%
Maturity Date	Dec. 01, 2054