Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Millions	Total	Common equities	Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock
Beginning Balance at Dec. 31, 2022		$ 397	$ 1,392	$ 11,711	$ (614)	$ (2,324)
Share-based awards		0	(6)			7
Share-based compensation			22
Other			2			1
Net Income	$ 759			759
Dividends declared				(235)
Other comprehensive loss	(12)				(12)
Shares acquired - share repurchase authorization						(67)
Shares acquired - share-based compensation plans						(3)
Ending Balance at Jun. 30, 2023	11,030	$ 397	1,410	12,235	(626)	(2,386)
Beginning Balance (in shares) at Dec. 31, 2022		157,100
Share-based awards (in shares)		300
Shares acquired - share repurchase authorization (in shares)		(600)
Shares acquired during period, Employee Share-Based Compensation Plans, Shares		0
Ending Balance (in shares) at Jun. 30, 2023		156,800
Dividends declared per common share (in dollars per share)		$ 1.50
Beginning Balance at Mar. 31, 2023		$ 397	1,398	11,818	(527)	(2,345)
Share-based awards		0	0			0
Share-based compensation			10
Other			2			1
Net Income	534			534
Dividends declared				(117)
Other comprehensive loss	(99)				(99)
Shares acquired - share repurchase authorization						(42)
Shares acquired - share-based compensation plans						0
Ending Balance at Jun. 30, 2023	11,030	$ 397	1,410	12,235	(626)	(2,386)
Beginning Balance (in shares) at Mar. 31, 2023		157,200
Share-based awards (in shares)		0
Shares acquired - share repurchase authorization (in shares)		(400)
Shares acquired during period, Employee Share-Based Compensation Plans, Shares		0
Ending Balance (in shares) at Jun. 30, 2023		156,800
Dividends declared per common share (in dollars per share)		$ 0.75
Beginning Balance at Dec. 31, 2023	12,098	$ 397	1,437	13,084	(435)	(2,385)
Share-based awards		0	0			12
Share-based compensation			26
Other			3			0
Net Income	1,067			1,067
Dividends declared				(254)
Other comprehensive loss	(35)				(35)
Shares acquired - share repurchase authorization						(121)
Shares acquired - share-based compensation plans						(19)
Ending Balance at Jun. 30, 2024	12,777	$ 397	1,466	13,897	(470)	(2,513)
Beginning Balance (in shares) at Dec. 31, 2023		157,000
Share-based awards (in shares)		400
Shares acquired - share repurchase authorization (in shares)		(1,100)
Shares acquired during period, Employee Share-Based Compensation Plans, Shares		(100)
Ending Balance (in shares) at Jun. 30, 2024		156,200
Dividends declared per common share (in dollars per share)		$ 1.62
Beginning Balance at Mar. 31, 2024		$ 397	1,446	13,712	(442)	(2,459)
Share-based awards		0	6			4
Share-based compensation			12
Other			2			0
Net Income	312			312
Dividends declared				(127)
Other comprehensive loss	(28)				(28)
Shares acquired - share repurchase authorization						(46)
Shares acquired - share-based compensation plans						(12)
Ending Balance at Jun. 30, 2024	$ 12,777	$ 397	$ 1,466	$ 13,897	$ (470)	$ (2,513)
Beginning Balance (in shares) at Mar. 31, 2024		156,500
Share-based awards (in shares)		100
Shares acquired - share repurchase authorization (in shares)		(400)
Shares acquired during period, Employee Share-Based Compensation Plans, Shares		0
Ending Balance (in shares) at Jun. 30, 2024		156,200
Dividends declared per common share (in dollars per share)		$ 0.81