Consolidated Statements of Changes in Shareholders’ Equity - USD ($) $ in Millions		Total	Common Stock	Paid-in Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Loss	Treasury Stock
Beginning balance (in shares) at Dec. 31, 2019			185,900,000
Beginning balance at Dec. 31, 2019		$ 6,121	$ 2	$ 6,700	$ (207)	$ (36)	$ (338)
Beginning balance (in shares) at Dec. 31, 2019							(5,100,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to common shareholders		709			709
Common stock issuances (in shares)	[1]		600,000				(100,000)
Common stock issuances	[1]	37		47			$ (10)
Net other comprehensive income		(13)				(13)
Dividends (declared per common share)		(400)			(400)
Ending balance (in shares) at Dec. 31, 2020			186,500,000
Ending balance at Dec. 31, 2020		6,454	$ 2	6,747	102	(49)	$ (348)
Ending balance (in shares) at Dec. 31, 2020							(5,200,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to common shareholders		1,263			1,263
Common stock issuances (in shares)	[1]		400,000				(100,000)
Common stock issuances	[1]	17		34			$ (17)
Net other comprehensive income		4				4
Dividends (declared per common share)		(440)			(440)
Ending balance (in shares) at Dec. 31, 2021			186,900,000
Ending balance at Dec. 31, 2021		$ 7,298	$ 2	6,781	925	(45)	$ (365)
Ending balance (in shares) at Dec. 31, 2021		(5,269,324)					(5,300,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to common shareholders		$ 820			820
Common stock issuances (in shares)	[1]		500,000				(100,000)
Common stock issuances	[1]	31		43			$ (12)
Net other comprehensive income		22				22
Dividends (declared per common share)		(478)			(478)
Ending balance (in shares) at Dec. 31, 2022			187,400,000
Ending balance at Dec. 31, 2022		$ 7,693	$ 2	$ 6,824	$ 1,267	$ (23)	$ (377)
Ending balance (in shares) at Dec. 31, 2022		(5,342,477)					(5,400,000)

[1] Includes stock-based compensation, employee stock purchase plan and direct stock reinvestment and direct stock purchase plan activity.