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Indebtedness - Summary of Total Indebtedness (Detail) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Principal Amount	$ 7,167	$ 7,694
Fair Value of Interest Rate Swap	(107)	(169)
Unamortized (Discount) Premium	(50)	(52)
Unamortized Debt Issuance Costs	(43)	(45)
Carrying Value	6,967	7,428
Current portion	0	(697)
Long-term debt	$ 6,967	$ 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	(22)	(32)
Unamortized (Discount) Premium	3	3
Unamortized Debt Issuance Costs	(4)	(4)
Carrying Value	$ 577	$ 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	(1)	(1)
Carrying Value	$ 586	$ 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	(7)	(13)
Unamortized (Discount) Premium	(2)	(2)
Unamortized Debt Issuance Costs	(1)	(1)
Carrying Value	$ 490	$ 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	(23)	(35)
Unamortized (Discount) Premium	(1)	(1)
Unamortized Debt Issuance Costs	(1)	(1)
Carrying Value	$ 375	$ 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	(25)	(35)
Unamortized (Discount) Premium	(6)	(6)
Unamortized Debt Issuance Costs	(3)	(3)
Carrying Value	$ 366	$ 356
0.950% Senior Notes Due 2030
Debt Instrument [Line Items]
Notes payable, interest rate	0.95%	0.95%
Principal Amount	$ 880	$ 776
Fair Value of Interest Rate Swap	0	0
Unamortized (Discount) Premium	(1)	(1)
Unamortized Debt Issuance Costs	(3)	(3)
Carrying Value	$ 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 Value		$ 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 Value	$ 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 Value	$ 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 Value	$ 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	(12)	(12)
Unamortized Debt Issuance Costs	(4)	(5)
Carrying Value	$ 584	$ 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	(6)	(7)
Unamortized Debt Issuance Costs	(5)	(5)
Carrying Value	$ 489	$ 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	(26)	(43)
Unamortized (Discount) Premium	(8)	(8)
Unamortized Debt Issuance Costs	(5)	(5)
Carrying Value	$ 461	$ 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	(4)	(8)
Unamortized (Discount) Premium	(2)	(2)
Unamortized Debt Issuance Costs	(3)	(3)
Carrying Value	$ 491	$ 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 Value	$ 492	$ 492

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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

No definition available.

+ Details

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