Consolidated Statements of Changes In Shareholders' Equity (Unaudited) - USD ($) $ in Millions		Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Parent [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 31, 2019		$ 2,300	$ 859	$ 14,323	$ 16,408	$ (19,812)	$ (1,171)	$ 12,907	$ 90	$ 12,997
Net income (loss)					(96)			(96)		(96)
Other comprehensive income (loss)							(326)	(326)	(1)	(327)
Shares issued to benefit plans and for option exercises				17				17		17
Common dividends					(168)			(168)		(168)
Preferred dividends					(24)			(24)		(24)
Other, net					(6)	(1)		(7)		(7)
Purchase of common stock for treasury						(105)		(105)		(105)
Balance at Mar. 31, 2020		2,300	859	14,340	16,114	(19,918)	(1,497)	12,198	89	12,287
Net income (loss)					(71)			(71)	6	(65)
Other comprehensive income (loss)							65	65		65
Shares issued to benefit plans and for option exercises			1	58				59		59
Common dividends					(171)			(171)		(171)
Preferred dividends					(25)			(25)		(25)
Other, net						(6)		(6)	(11)	(17)
Balance at Jun. 30, 2020		2,300	860	14,398	15,847	(19,924)	(1,432)	12,049	84	12,133
Net income (loss)					427			427	5	432
Other comprehensive income (loss)							298	298	1	299
Shares issued to benefit plans and for option exercises			1	96				97		97
Common dividends					(171)			(171)		(171)
Preferred dividends					(24)			(24)		(24)
Other, net					(14)	(2)		(16)	5	(11)
Non-controlling interest in HSG	[1]								102	102
Balance at Sep. 30, 2020		2,300	861	14,494	16,065	(19,926)	(1,134)	12,660	197	12,857
Balance at Dec. 31, 2020		2,300	863	14,642	16,120	(19,928)	(740)	13,257	191	13,448
Net income (loss)					599			599	2	601
Other comprehensive income (loss)							(352)	(352)	(1)	(353)
Shares issued to benefit plans and for option exercises			1	80				81		81
Common dividends					(187)			(187)		(187)
Preferred dividends					(24)			(24)		(24)
Other, net					1	(6)		(5)	(3)	(8)
Balance at Mar. 31, 2021		2,300	864	14,722	16,509	(19,934)	(1,092)	13,369	189	13,558
Net income (loss)					449			449	5	454
Other comprehensive income (loss)							40	40	1	41
Shares issued to benefit plans and for option exercises			3	70				73		73
Common dividends					(416)			(416)		(416)
Other, net	[2]					(51)		(51)	(13)	(64)
Redemption of preferred stock	[3]	(700)			(803)			(1,503)		(1,503)
Conversion of preferred stock to common stock	[4]	(1,600)	40	1,560						0
Purchase of common stock for treasury						(1)		(1)		(1)
Balance at Jun. 30, 2021		0	907	16,352	15,739	(19,986)	(1,052)	11,960	182	12,142
Net income (loss)					371			371	13	384
Other comprehensive income (loss)							(207)	(207)		(208)
Shares issued to benefit plans and for option exercises				46				46		46
Other, net						(1)		(1)	16	15
Purchase of common stock for treasury						(24)		(24)		(24)
Balance at Sep. 30, 2021		$ 0	$ 907	$ 16,398	$ 16,110	$ (20,011)	$ (1,259)	$ 12,145	$ 210	$ 12,355

[1] Refer to Note 3 (HSG Transactions) to the consolidated financial statements for more information.

[2] Treasury stock includes the deemed surrender to the Company of common stock to satisfy employee tax withholding obligations.

[3] Refer to Note 6 (Earnings per Share) and Note 14 (Shareholders' Equity) to the consolidated financial statements for additional information.

[4] Refer to Note 14 (Shareholders' Equity) to the consolidated financial statements for additional information.