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	1,303			1,293		1,293	10
Issuance of stock	97		$ 97			97
Issuance of stock (in shares)			1
Stock awards (net of change in unearned compensation)	15		$ 15			15
Preferred stock dividends (see Note 16)	(32)			(32)		(32)
Common stock dividends and distributions	(1,036)			(1,016)		(1,016)	(20)
Other comprehensive income, net of tax	77				77	77
Other	(1)		(1)			(1)
Ending balance at Jun. 30, 2021	26,884	$ 2,387	$ 21,369	4,434	(1,640)	26,550	334
Ending balance (in shares) at Jun. 30, 2021		2	807
Beginning balance at Mar. 31, 2021	27,038	$ 2,387	$ 21,310	4,673	(1,671)	26,699	339
Beginning balance (in shares) at Mar. 31, 2021		2	806
Net income (loss) including noncontrolling interests	295			285		285	10
Issuance of stock	49		$ 49			49
Issuance of stock (in shares)			1
Stock awards (net of change in unearned compensation)	11		$ 11			11
Preferred stock dividends (see Note 16)	(16)			(16)		(16)
Common stock dividends and distributions	(523)			(508)		(508)	(15)
Other comprehensive income, net of tax	31				31	31
Other	(1)		(1)			(1)
Ending balance at Jun. 30, 2021	26,884	$ 2,387	$ 21,369	4,434	(1,640)	26,550	$ 334
Ending balance (in shares) at Jun. 30, 2021		2	807
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	258			258		258
Issuance of stock	1,803		$ 1,803			1,803
Issuance of stock (in shares)			22
Stock awards (net of change in unearned compensation)	14		$ 14			14
Preferred stock dividends (see Note 16)	(52)			(52)		(52)
Common stock dividends and distributions	(1,096)			(1,096)		(1,096)
Other comprehensive income, net of tax	62				62	62
Ending balance at Jun. 30, 2022	28,297	$ 1,783	$ 23,427	4,483	(1,396)	28,297
Ending balance (in shares) at Jun. 30, 2022		2	832
Beginning balance at Mar. 31, 2022	27,520	$ 1,783	$ 21,657	5,516	(1,436)	27,520
Beginning balance (in shares) at Mar. 31, 2022		2	811
Net income (loss) including noncontrolling interests	(453)			(453)		(453)
Issuance of stock	1,758		$ 1,758			1,758
Issuance of stock (in shares)			21
Stock awards (net of change in unearned compensation)	12		$ 12			12
Preferred stock dividends (see Note 16)	(25)			(25)		(25)
Common stock dividends and distributions	(555)			(555)		(555)
Other comprehensive income, net of tax	40				40	40
Ending balance at Jun. 30, 2022	$ 28,297	$ 1,783	$ 23,427	$ 4,483	$ (1,396)	$ 28,297
Ending balance (in shares) at Jun. 30, 2022		2	832