Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Millions	Total	Preferred Stock [Member]	Common Stock	Additional Paid-in Capital	Retained Earnings	AOCI Attributable to Parent [Member]	Treasury Stock, Common	Share-based Payment Arrangement [Member] Treasury Stock, Common
Beginning balance at Dec. 31, 2021	$ 17,805			$ 3,309	$ 15,770	$ 128	$ (1,740)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under incentive and stock compensation plans and other				(115)
Stock-based compensation plans expense				55
Net income	443				443
Dividends declared on preferred stock	(5)				(5)
Dividends declared on common stock					(127)
Treasury stock acquired	(400)						(400)
Issuance of shares under incentive and stock compensation plans from treasury stock and other								$ 124
Net shares acquired related to employee incentive and stock compensation plans							(52)
Total other comprehensive income (loss)						(1,838)
Ending balance at Mar. 31, 2022	$ 15,890	$ 334	$ 4	3,249	16,081	(1,710)	(2,068)
Preferred Stock, Shares Outstanding, Ending Balance at Mar. 31, 2022		13,800
Common Shares Outstanding, beginning of period at Dec. 31, 2021			334,926
Shares Granted or Issued, Share-based Payment Arrangement [Abstract]
Treasury stock acquired	(5,700)		(5,682)
Issuance of shares under incentive and stock compensation plans and other			2,210
Return of shares under incentive and stock compensation plans to treasury stock			(745)
Common Shares Outstanding, at end of period at Mar. 31, 2022			330,709
Shares Granted or Issued, Share-based Payment Arrangement [Abstract]
Cash dividends declared per common share	$ 0.385
Cash dividends declared per preferred share	$ 375.00
Beginning balance at Dec. 31, 2022	$ 13,676			1,895	17,058	(3,841)	(1,773)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under incentive and stock compensation plans and other				(114)
Stock-based compensation plans expense				66
Net income	535				535
Dividends declared on preferred stock	(5)				(5)
Dividends declared on common stock					(134)
Treasury stock acquired	(350)						(354)
Issuance of shares under incentive and stock compensation plans from treasury stock and other								$ 132
Net shares acquired related to employee incentive and stock compensation plans							(49)
Total other comprehensive income (loss)						587
Ending balance at Mar. 31, 2023	$ 14,340	$ 334	$ 3	$ 1,847	$ 17,454	$ (3,254)	$ (2,044)
Preferred Stock, Shares Outstanding, Ending Balance at Mar. 31, 2023		13,800
Common Shares Outstanding, beginning of period at Dec. 31, 2022			315,111
Shares Granted or Issued, Share-based Payment Arrangement [Abstract]
Treasury stock acquired	(4,700)		(4,719)
Issuance of shares under incentive and stock compensation plans and other			2,005
Return of shares under incentive and stock compensation plans to treasury stock			(617)
Common Shares Outstanding, at end of period at Mar. 31, 2023			311,780
Shares Granted or Issued, Share-based Payment Arrangement [Abstract]
Cash dividends declared per common share	$ 0.425
Cash dividends declared per preferred share	$ 375.00