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 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
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 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