Condensed Statements of Consolidated Changes in Equity (Unaudited) - USD ($) $ in Millions	Total	Preferred Stock	Preferred Stock Series B and Series C Preferred Stock	Common Stock	Additional Paid-in-Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Loss
Balance, beginning of period (in shares) at Dec. 31, 2020		3,000,000
Balance, beginning of period at Dec. 31, 2020		$ 2,363		$ 6	$ 6,914	$ (845)	$ (90)
Balance, beginning of period (in shares) at Dec. 31, 2020				551,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of Series B Preferred Stock and Series C Preferred Stock (in shares)			(2,000,000)
Conversion of Series B Preferred Stock and Series C Preferred Stock			$ (1,573)
Issuances of Common Stock (in shares)				77,000,000
Issuances of Common Stock				$ 0	1,573
Issuances related to benefit and investment plans (in shares)				1,000,000
Issuances related to benefit and investment plans				$ 0	30
Net income	$ 832					832
Common Stock dividends declared (see Note 18)						(297)
Preferred Stock dividends declared (see Note 18)						(58)
Other comprehensive income (loss)							10
Balance, end of period (in shares) at Sep. 30, 2021		1,000,000
Balance, end of period at Sep. 30, 2021	8,865	$ 790		$ 6	8,517	(368)	(80)
Balance, end of period (in shares) at Sep. 30, 2021				629,000,000
Balance, beginning of period (in shares) at Jun. 30, 2021		3,000,000
Balance, beginning of period at Jun. 30, 2021		$ 1,739		$ 6	7,553	(343)	(85)
Balance, beginning of period (in shares) at Jun. 30, 2021				593,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of Series B Preferred Stock and Series C Preferred Stock (in shares)			(2,000,000)
Conversion of Series B Preferred Stock and Series C Preferred Stock			$ (949)
Issuances of Common Stock (in shares)				36,000,000
Issuances of Common Stock				$ 0	949
Issuances related to benefit and investment plans (in shares)				0
Issuances related to benefit and investment plans				$ 0	15
Net income	218					218
Common Stock dividends declared (see Note 18)						(202)
Preferred Stock dividends declared (see Note 18)						(41)
Other comprehensive income (loss)							5
Balance, end of period (in shares) at Sep. 30, 2021		1,000,000
Balance, end of period at Sep. 30, 2021	$ 8,865	$ 790		$ 6	8,517	(368)	(80)
Balance, end of period (in shares) at Sep. 30, 2021				629,000,000
Balance, beginning of period (in shares) at Dec. 31, 2021	800,000	1,000,000
Balance, beginning of period at Dec. 31, 2021	$ 9,415	$ 790		$ 6	8,529	154	(64)
Balance, beginning of period (in shares) at Dec. 31, 2021	628,923,534			629,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of Series B Preferred Stock and Series C Preferred Stock (in shares)			0
Conversion of Series B Preferred Stock and Series C Preferred Stock			$ 0
Issuances of Common Stock (in shares)				0
Issuances of Common Stock				$ 0	0
Issuances related to benefit and investment plans (in shares)				0
Issuances related to benefit and investment plans				$ 0	28
Net income	$ 923					923
Common Stock dividends declared (see Note 18)						(334)
Preferred Stock dividends declared (see Note 18)						(24)
Other comprehensive income (loss)							(19)
Balance, end of period (in shares) at Sep. 30, 2022	800,000	1,000,000
Balance, end of period at Sep. 30, 2022	$ 9,989	$ 790		$ 6	8,557	719	(83)
Balance, end of period (in shares) at Sep. 30, 2022	629,532,024			629,000,000
Balance, beginning of period (in shares) at Jun. 30, 2022		1,000,000
Balance, beginning of period at Jun. 30, 2022		$ 790		$ 6	8,544	768	(85)
Balance, beginning of period (in shares) at Jun. 30, 2022				629,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of Series B Preferred Stock and Series C Preferred Stock (in shares)			0
Conversion of Series B Preferred Stock and Series C Preferred Stock			$ 0
Issuances of Common Stock (in shares)				0
Issuances of Common Stock				$ 0	0
Issuances related to benefit and investment plans (in shares)				0
Issuances related to benefit and investment plans				$ 0	13
Net income	$ 202					202
Common Stock dividends declared (see Note 18)						(227)
Preferred Stock dividends declared (see Note 18)						(24)
Other comprehensive income (loss)							2
Balance, end of period (in shares) at Sep. 30, 2022	800,000	1,000,000
Balance, end of period at Sep. 30, 2022	$ 9,989	$ 790		$ 6	$ 8,557	$ 719	$ (83)
Balance, end of period (in shares) at Sep. 30, 2022	629,532,024			629,000,000