Long-Term Debt - Long-Term Debt (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Total debt	$ 4,347	$ 4,346
Less: Current maturities	(400)	(400)
Long-term debt	3,947	3,946
4.250% Senior Notes, Due 2024
Debt Instrument [Line Items]
Total debt	400	400
7% Debentures, Due 2025
Debt Instrument [Line Items]
Total debt	125	125
3.450% Senior Notes, Due 2027
Debt Instrument [Line Items]
Total debt	299	299
3.500% Senior Notes, Due 2027
Debt Instrument [Line Items]
Total debt	492	492
2.500% Senior Notes, Due 2030
Debt Instrument [Line Items]
Total debt	472	472
2.400% Senior Notes, Due 2031
Debt Instrument [Line Items]
Total debt	890	890
6.25% Senior Notes, Due 2037
Debt Instrument [Line Items]
Total debt	229	228
4.250% Senior Notes, Due 2047
Debt Instrument [Line Items]
Total debt	590	590
3.200% Senior Notes, Due 2051
Debt Instrument [Line Items]
Total debt	$ 850	$ 850