Consolidated Statements of Changes In Shareholders' Equity - 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, 2018		$ 2,300	$ 857	$ 14,212	$ 16,303	$ (18,870)	$ (1,010)	$ 13,792	$ 94	$ 13,886
Net income (loss)					960			960	19	979
Other comprehensive income (loss)							(161)	(161)		(161)
Shares purchased for treasury						(925)		(925)		(925)
Shares issued to benefit plans and for option exercises			2	111				113		113
Common dividends					(625)			(625)		(625)
Preferred dividends					(98)			(98)		(98)
Other, net	[1]				(132)	(17)		(149)	(23)	(172)
Balance at Dec. 31, 2019		2,300	859	14,323	16,408	(19,812)	(1,171)	12,907	90	12,997
Net income (loss)					512			512	11	523
Other comprehensive income (loss)							431	431	1	432
Shares purchased for treasury						(105)		(105)		(105)
Shares issued to benefit plans and for option exercises			4	319				323		323
Common dividends					(681)			(681)		(681)
Preferred dividends					(98)			(98)		(98)
Other, net						(11)		(32)	(13)	(45)
Non-controlling interest in HSG (2)	[2]								102	102
Balance at Dec. 31, 2020		2,300	863	14,642	16,120	(19,928)	(740)	13,257	191	13,448
Net income (loss)					1,906			1,906	29	1,935
Other comprehensive income (loss)							(435)	(435)	(1)	(436)
Shares purchased for treasury						(274)		(274)		(274)
Shares issued to benefit plans and for option exercises			4	273				277		277
Common dividends					(812)			(812)		(812)
Preferred dividends					(24)			(24)		(24)
Other, net					2	(61)		(59)	(7)	(66)
Redemption of preferred stock	[3]	(700)			(803)			(1,503)		(1,503)
Conversion of preferred stock to common stock	[4]	(1,600)	40	1,560
Balance at Dec. 31, 2021		$ 0	$ 907	$ 16,475	$ 16,389	$ (20,263)	$ (1,175)	$ 12,333	$ 212	$ 12,545

[1] Adjustments to retained earnings include the effect of the accounting changes recorded for the adoption of the new standard for reclassification of stranded tax effects in accumulated other comprehensive loss in the amount of $53 million and the impact of an equity affiliate's adoption of the new revenue standard in January 2019. A net reduction of $186 million net of tax was recorded to beginning retained earnings for performance obligations of which a significant amount settled by the end of 2019.

[2] Refer to Note 4 (HSG Transactions and Acquisitions) to the consolidated financial statements for more information.

[3] Refer to Note 17 (Shareholders' Equity) and Note 18 (Earnings per Common Share) to the consolidated financial statements for additional information.

[4] Refer to Note 17 (Shareholders' Equity) to the consolidated financial statement for additional information.