EARNINGS PER SHARE - Computation of Basic and Diluted EPS (two-class method) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Sep. 30, 2023
Numerator for earnings per share:
Net income	$ 382	$ 229
Less: Net income attributable to noncontrolling interests	0	1
Net income attributable to TD Group	382	228
Less: Dividends paid on participating securities (1)	(101)	(38)
Net income applicable to TD Group common stockholders—basic and diluted	$ 281	$ 190
Denominator for basic and diluted earnings per share under the two-class method:
Weighted-average common shares outstanding - basic (in shares)	55.4	54.4
Weighted-average common shares outstanding - diluted (in shares)	55.4	54.4
Vested options deemed participating securities	2.3	2.7
Weighted-average shares outstanding - basic (in shares)	57.7	57.1
Weighted-average shares outstanding - diluted (in shares)	57.7	57.1
Earnings per share - basic (in usd per share)	$ 4.87	$ 3.33
Earnings per share - diluted (in usd per share)	$ 4.87	$ 3.33
Total Payments Of Dividend Equivalents	$ 101	$ 38
Dividend equivalent payments	$ 83		$ 18
Dividend declared (in usd per share)	$ 35.00