CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common stock	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Balance (in shares) at Dec. 31, 2019		524,539,000
Beginning balance at Dec. 31, 2019	$ 13,239	$ 1,311	$ 6,656	$ 5,413	$ (141)
Increase (Decrease) in Stockholders' Equity
Net income	1,473
Other comprehensive income					0
Cash dividends declared per common share (in dollars per share)		$ 1.72
Dividends declared on common stock	(909)			(909)
Issuances of common stock (in shares)		12,953,869
Issuances of common stock (value)	764	$ 33	731
Stock repurchased during period (in shares)		(54,475)
Repurchases of common stock (value)	(4)	$ 0	(4)
Share-based compensation	14		21	(7)
Credit Losses, Topic 326 (ASC Topic 326)	(2)			(2)
Balance (in shares) at Dec. 31, 2020		537,438,394
Ending balance at Dec. 31, 2020	14,575	$ 1,344	7,404	5,968	(141)
Increase (Decrease) in Stockholders' Equity
Net income	1,597
Other comprehensive income	18				18
Cash dividends declared per common share (in dollars per share)		$ 1.83
Dividends declared on common stock	(989)			(989)
Issuances of common stock (in shares)		6,586,875
Issuances of common stock (value)	403	$ 16	387
Share-based compensation	$ 8		12	(4)
Balance (in shares) at Dec. 31, 2021	544,025,269	544,025,269
Ending balance at Dec. 31, 2021	$ 15,612	$ 1,360	7,803	6,572	(123)
Increase (Decrease) in Stockholders' Equity
Net income	1,736
Other comprehensive income	30				30
Cash dividends declared per common share (in dollars per share)		$ 1.95
Dividends declared on common stock	(1,066)			(1,066)
Issuances of common stock (in shares)		5,552,749
Issuances of common stock (value)	359	$ 14	345
Share-based compensation	$ 4		7	(3)
Balance (in shares) at Dec. 31, 2022	549,578,018	549,578,018
Ending balance at Dec. 31, 2022	$ 16,675	$ 1,374	$ 8,155	$ 7,239	$ (93)