Equity - Rollforward of common stock outstanding (Details)	9 Months Ended
	Sep. 30, 2023 shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued, beginning of year (in shares)	1,906,671,492
Treasury stock, beginning of year (in shares)	(1,172,543,436)
Shares outstanding, beginning of year (in shares)	734,100,000
Shares issued (in shares)	5,100,000
Shares repurchased (in shares)	(34,600,000)
Shares issued, end of period (in shares)	1,906,671,492
Treasury stock, end of period (in shares)	(1,202,096,780)
Shares outstanding, end of period (in shares)	704,600,000
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued, beginning of year (in shares)	1,906,700,000
Shares issued (in shares)	0
Shares repurchased (in shares)	0
Shares issued, end of period (in shares)	1,906,700,000
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury stock, beginning of year (in shares)	(1,172,600,000)
Shares issued (in shares)	5,100,000
Shares repurchased (in shares)	(34,600,000)
Treasury stock, end of period (in shares)	(1,202,100,000)