Indebtedness - Summary of Total Indebtedness (Detail) - USD ($) $ in Millions	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Principal Amount	$ 7,168		$ 7,694
Fair Value of Interest Rate Swap	(84)		(169)
Unamortized (Discount) Premium	(49)		(52)
Unamortized Debt Issuance Costs	(41)		(45)
Carrying Amount	6,994		7,428
Current portion	0		(697)
Long-term debt	$ 6,994		$ 6,731
5.25% 2014 Senior Notes, due 2044
Debt Instrument [Line Items]
Notes payable, interest rate	5.25%		5.25%
Principal Amount	$ 600		$ 600
Fair Value of Interest Rate Swap	(18)		(32)
Unamortized (Discount) Premium	3		3
Unamortized Debt Issuance Costs	(4)		(4)
Carrying Amount	$ 581		$ 567
1.75% 2015 Senior Notes, due 2027
Debt Instrument [Line Items]
Notes payable, interest rate	1.75%		1.75%
Principal Amount	$ 587		$ 518
Fair Value of Interest Rate Swap	0		0
Unamortized (Discount) Premium	0		0
Unamortized Debt Issuance Costs	0		(1)
Carrying Amount	$ 587		$ 517
3.25% 2017 Senior Notes, due 2028
Debt Instrument [Line Items]
Notes payable, interest rate	3.25%		3.25%
Principal Amount	$ 500		$ 500
Fair Value of Interest Rate Swap	0		(13)
Unamortized (Discount) Premium	(1)		(2)
Unamortized Debt Issuance Costs	(1)		(1)
Carrying Amount	$ 498		$ 484
4.25% 2018 Senior Notes, due 2029
Debt Instrument [Line Items]
Notes payable, interest rate	4.25%		4.25%
Principal Amount	$ 400		$ 400
Fair Value of Interest Rate Swap	(19)		(35)
Unamortized (Discount) Premium	(1)		(1)
Unamortized Debt Issuance Costs	(1)		(1)
Carrying Amount	$ 379		$ 363
4.875% 2018 Senior Notes, due 2048
Debt Instrument [Line Items]
Notes payable, interest rate	4.875%		4.875%
Principal Amount	$ 400		$ 400
Fair Value of Interest Rate Swap	(21)		(35)
Unamortized (Discount) Premium	(6)		(6)
Unamortized Debt Issuance Costs	(3)		(3)
Carrying Amount	$ 370		$ 356
0.950% 2019 Senior Notes, due 2030
Debt Instrument [Line Items]
Notes payable, interest rate	0.95%		0.95%
Principal Amount	$ 881		$ 776
Fair Value of Interest Rate Swap	0		0
Unamortized (Discount) Premium	(2)		(1)
Unamortized Debt Issuance Costs	(3)		(3)
Carrying Amount	$ 876		$ 772
3.75% 2020 Senior Notes, due 2025
Debt Instrument [Line Items]
Notes payable, interest rate		3.75%	3.75%
Principal Amount			$ 700
Fair Value of Interest Rate Swap			(3)
Unamortized (Discount) Premium			0
Unamortized Debt Issuance Costs			0
Carrying Amount			$ 697
3.25% 2020 Senior Notes, due 2050
Debt Instrument [Line Items]
Notes payable, interest rate	3.25%		3.25%
Principal Amount	$ 300		$ 300
Fair Value of Interest Rate Swap	0		0
Unamortized (Discount) Premium	(4)		(4)
Unamortized Debt Issuance Costs	(3)		(3)
Carrying Amount	$ 293		$ 293
2.55% 2020 Senior Notes, due 2060
Debt Instrument [Line Items]
Notes payable, interest rate	2.55%		2.55%
Principal Amount	$ 300		$ 300
Fair Value of Interest Rate Swap	0		0
Unamortized (Discount) Premium	(2)		(2)
Unamortized Debt Issuance Costs	(3)		(3)
Carrying Amount	$ 295		$ 295
2.00% 2021 Senior Notes, due 2031
Debt Instrument [Line Items]
Notes payable, interest rate	2.00%		2.00%
Principal Amount	$ 600		$ 600
Fair Value of Interest Rate Swap	0		0
Unamortized (Discount) Premium	(5)		(6)
Unamortized Debt Issuance Costs	(3)		(4)
Carrying Amount	$ 592		$ 590
2.75% 2021 Senior Notes, due 2041
Debt Instrument [Line Items]
Notes payable, interest rate	2.75%		2.75%
Principal Amount	$ 600		$ 600
Fair Value of Interest Rate Swap	0		0
Unamortized (Discount) Premium	(11)		(12)
Unamortized Debt Issuance Costs	(4)		(5)
Carrying Amount	$ 585		$ 583
3.10% 2021 Senior Notes, due 2061
Debt Instrument [Line Items]
Notes payable, interest rate	3.10%		3.10%
Principal Amount	$ 500		$ 500
Fair Value of Interest Rate Swap	0		0
Unamortized (Discount) Premium	(7)		(7)
Unamortized Debt Issuance Costs	(5)		(5)
Carrying Amount	$ 488		$ 488
3.75% 2022 Senior Notes, due 2052
Debt Instrument [Line Items]
Notes payable, interest rate	3.75%		3.75%
Principal Amount	$ 500		$ 500
Fair Value of Interest Rate Swap	(23)		(43)
Unamortized (Discount) Premium	(8)		(8)
Unamortized Debt Issuance Costs	(4)		(5)
Carrying Amount	$ 465		$ 444
4.25% 2022 Senior Notes, due 2032
Debt Instrument [Line Items]
Notes payable, interest rate	4.25%		4.25%
Principal Amount	$ 500		$ 500
Fair Value of Interest Rate Swap	(3)		(8)
Unamortized (Discount) Premium	(1)		(2)
Unamortized Debt Issuance Costs	(3)		(3)
Carrying Amount	$ 493		$ 487
5.00% 2024 Senior Notes, due 2034
Debt Instrument [Line Items]
Notes payable, interest rate	5.00%		5.00%
Principal Amount	$ 500		$ 500
Fair Value of Interest Rate Swap	0		0
Unamortized (Discount) Premium	(4)		(4)
Unamortized Debt Issuance Costs	(4)		(4)
Carrying Amount	$ 492		$ 492