CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Capital Stock Expense	Accumulated Other Comprehensive Income (Loss)
Beginning balance (shares) at Dec. 31, 2023		345
Beginning balance at Dec. 31, 2023	$ 21,158	$ 37	$ 9,861	$ 13,377	$ (2,017)	$ (122)	$ 22
Beginning balance (shares) at Dec. 31, 2023					34
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	720			720
Common stock dividends	(287)			(287)
Issuance of common shares for stock plans (shares)		1
Issuance of common shares for stock plans	28	$ 1	27
Other comprehensive (loss) income	(4)						(4)
Ending balance (shares) at Mar. 31, 2024		346
Ending balance at Mar. 31, 2024	21,615	$ 38	9,888	13,810	$ (2,017)	(122)	18
Ending balance (shares) at Mar. 31, 2024					34
Beginning balance (shares) at Dec. 31, 2023		345
Beginning balance at Dec. 31, 2023	21,158	$ 37	9,861	13,377	$ (2,017)	(122)	22
Beginning balance (shares) at Dec. 31, 2023					34
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,510
Ending balance (shares) at Sep. 30, 2024		346
Ending balance at Sep. 30, 2024	21,898	$ 38	9,955	14,026	$ (2,017)	(122)	18
Ending balance (shares) at Sep. 30, 2024					34
Beginning balance (shares) at Mar. 31, 2024		346
Beginning balance at Mar. 31, 2024	21,615	$ 38	9,888	13,810	$ (2,017)	(122)	18
Beginning balance (shares) at Mar. 31, 2024					34
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	202			202
Common stock dividends	(287)			(287)
Issuance of common shares for stock plans	30		30
Ending balance (shares) at Jun. 30, 2024		346
Ending balance at Jun. 30, 2024	21,560	$ 38	9,918	13,725	$ (2,017)	(122)	18
Ending balance (shares) at Jun. 30, 2024					34
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	588			588
Common stock dividends	(287)			(287)
Issuance of common shares for stock plans	26		26
Stock awards	11		11
Ending balance (shares) at Sep. 30, 2024		346
Ending balance at Sep. 30, 2024	21,898	$ 38	9,955	14,026	$ (2,017)	(122)	18
Ending balance (shares) at Sep. 30, 2024					34
Beginning balance (shares) at Dec. 31, 2024		347
Beginning balance at Dec. 31, 2024	21,962	$ 38	9,986	14,048	$ (2,017)	(122)	29
Beginning balance (shares) at Dec. 31, 2024					34
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	791			791
Common stock dividends	(295)			(295)
Issuance of common shares – public offering (shares)		13
Issuance of common shares - public offering	1,308		1,326			(18)
Issuance of common shares for stock plans	29	$ 1	28
Other comprehensive (loss) income	(12)						(12)
Ending balance (shares) at Mar. 31, 2025		360
Ending balance at Mar. 31, 2025	23,783	$ 39	11,340	14,544	$ (2,017)	(140)	17
Ending balance (shares) at Mar. 31, 2025					34
Beginning balance (shares) at Dec. 31, 2024		347
Beginning balance at Dec. 31, 2024	21,962	$ 38	9,986	14,048	$ (2,017)	(122)	29
Beginning balance (shares) at Dec. 31, 2024					34
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,726
Ending balance (shares) at Sep. 30, 2025		361
Ending balance at Sep. 30, 2025	24,168	$ 39	11,404	14,865	$ (2,017)	(140)	17
Ending balance (shares) at Sep. 30, 2025					34
Beginning balance (shares) at Mar. 31, 2025		360
Beginning balance at Mar. 31, 2025	23,783	$ 39	11,340	14,544	$ (2,017)	(140)	17
Beginning balance (shares) at Mar. 31, 2025					34
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	246			246
Common stock dividends	(306)			(306)
Issuance of common shares for stock plans (shares)		1
Issuance of common shares for stock plans	30		30
Stock awards	3		3
Ending balance (shares) at Jun. 30, 2025		361
Ending balance at Jun. 30, 2025	23,756	$ 39	11,373	14,484	$ (2,017)	(140)	17
Ending balance (shares) at Jun. 30, 2025					34
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	688			688
Common stock dividends	(307)			(307)
Issuance of common shares for stock plans	29		29
Stock awards	2		2
Ending balance (shares) at Sep. 30, 2025		361
Ending balance at Sep. 30, 2025	$ 24,168	$ 39	$ 11,404	$ 14,865	$ (2,017)	$ (140)	$ 17
Ending balance (shares) at Sep. 30, 2025					34