Common Stock - Shares Issued (Details) - shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Increase (Decrease) in Common Stock Shares
Total issued - balance at January 1 (in shares)	4,104,933,895	4,104,933,895	4,104,900,000	4,104,900,000
Total outstanding - balance at December 31 (in shares)	2,934,200,000	2,944,100,000	3,049,400,000
Treasury stock
Increase (Decrease) in Treasury Stock Shares
Treasury - balance at January 1 (in shares)	(1,160,800,000)	(1,055,500,000)	(1,020,900,000)
Repurchase (in shares)	(23,100,000)	(119,700,000)	(50,000,000.0)
Reissuance (in shares)	13,200,000	14,400,000	15,400,000
Reissuance: Employee stock purchase plans (in shares)	1,200,000	900,000	1,200,000
Total treasury - balance at December 31 (in shares)	(1,170,700,000)	(1,160,800,000)	(1,055,500,000)
Treasury stock | Employee benefits and compensation plans
Increase (Decrease) in Treasury Stock Shares
Reissuance (in shares)	12,000,000.0	13,500,000	14,200,000