Earnings per Common Share (Schedule of Basic and Diluted Earnings per Common Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2022		Sep. 30, 2021		Sep. 30, 2022		Sep. 30, 2021
Class of Stock [Line Items]
Net income from continuing operations		$ 300	[1]	$ 712		$ 1,437	[1]	$ 2,407	[1]
Net income from continuing operations attributable to common stockholders	[1]	273		683		1,354		2,378
(Loss) income from discontinued operations, net of tax		(1)	[1]	0	[1]	(1)		1	[1]
Net income attributable to common stockholders	[1]	$ 272		$ 683		$ 1,353		$ 2,379
Basic weighted-average common shares outstanding (in shares)	[1],[2]	308,220		359,179		321,884		368,215
Diluted weighted-average common shares outstanding (in shares)	[1],[2]	310,086		361,855		323,875		370,745
Basic earnings per common share
Net income from continuing operations (in dollars per share)	[1]	$ 0.88		$ 1.90		$ 4.20		$ 6.46
Net income (in dollars per share)	[1]	0.88		1.90		4.20		6.46
Diluted earnings per common share
Net income from continuing operations (in dollars per share)	[1]	0.88		1.89		4.18		6.41
Net income (in dollars per share)	[1]	$ 0.88		$ 1.89		$ 4.18		$ 6.42
Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock dividends	[1]	$ (16)		$ (20)		$ (48)		$ (20)
Series C Preferred Stock
Class of Stock [Line Items]
Preferred stock dividends	[1]	$ (11)		$ (9)		$ (35)		$ (9)

[1] Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers.

[2] Includes shares related to share-based compensation that vested but were not yet issued.