Consolidated Statements of Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Preferred Stock	Common Stock	Retained Earnings	AOCI	Total Shareholders' Equity	Noncontrolling Interests
Beginning balance at Dec. 31, 2020	$ 26,461	$ 2,387	$ 21,258	$ 4,189	$ (1,717)	$ 26,117	$ 344
Beginning balance (in shares) at Dec. 31, 2020		2	806
Net income (loss) including noncontrolling interests	1,969			1,947		1,947	22
Issuance of stock	292		$ 292			292
Issuance of stock (in shares)			4
Stock awards (net of change in unearned compensation)	24		$ 24			24
Preferred stock dividends (see Note 16)	(48)			(48)		(48)
Common stock dividends and distributions	(1,566)			(1,526)		(1,526)	(40)
Other comprehensive income, net of tax	101				101	101
Other	(1)		(1)			(1)
Ending balance at Sep. 30, 2021	27,232	$ 2,387	$ 21,573	4,562	(1,616)	26,906	326
Ending balance (in shares) at Sep. 30, 2021		2	810
Beginning balance at Jun. 30, 2021	26,884	$ 2,387	$ 21,369	4,434	(1,640)	26,550	334
Beginning balance (in shares) at Jun. 30, 2021		2	807
Net income (loss) including noncontrolling interests	666			654		654	12
Issuance of stock	195		$ 195			195
Issuance of stock (in shares)			3
Stock awards (net of change in unearned compensation)	9		$ 9			9
Preferred stock dividends (see Note 16)	(16)			(16)		(16)
Common stock dividends and distributions	(529)			(510)		(510)	(19)
Other comprehensive income, net of tax	24				24	24
Other	(1)						(1)
Ending balance at Sep. 30, 2021	27,232	$ 2,387	$ 21,573	4,562	(1,616)	26,906	$ 326
Ending balance (in shares) at Sep. 30, 2021		2	810
Beginning balance at Dec. 31, 2021	27,308	$ 1,783	$ 21,610	5,373	(1,458)	27,308
Beginning balance (in shares) at Dec. 31, 2021		2	810
Net income (loss) including noncontrolling interests	1,036			1,036		1,036
Issuance of stock	1,847		$ 1,847			1,847
Issuance of stock (in shares)			23
Stock awards (net of change in unearned compensation)	23		$ 23			23
Preferred stock dividends (see Note 16)	(72)			(72)		(72)
Common stock dividends and distributions	(1,653)			(1,653)		(1,653)
Other comprehensive income, net of tax	84				84	84
Ending balance at Sep. 30, 2022	28,573	$ 1,783	$ 23,480	4,684	(1,374)	28,573
Ending balance (in shares) at Sep. 30, 2022		2	833
Beginning balance at Jun. 30, 2022	28,297	$ 1,783	$ 23,427	4,483	(1,396)	28,297
Beginning balance (in shares) at Jun. 30, 2022		2	832
Net income (loss) including noncontrolling interests	778			778		778
Issuance of stock	44		$ 44			44
Issuance of stock (in shares)			1
Stock awards (net of change in unearned compensation)	9		$ 9			9
Preferred stock dividends (see Note 16)	(20)			(20)		(20)
Common stock dividends and distributions	(557)			(557)		(557)
Other comprehensive income, net of tax	22				22	22
Ending balance at Sep. 30, 2022	$ 28,573	$ 1,783	$ 23,480	$ 4,684	$ (1,374)	$ 28,573
Ending balance (in shares) at Sep. 30, 2022		2	833