Aggregate number of common shares reserved for future issuance.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Employee Incentive, Retirement, Deferred Compensation, and Career Achievement Plans (Employee Incentive Narrative) (Details) - USD ($) $ in Millions		12 Months Ended
	Oct. 06, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares authorized to be granted (in shares)		58,000,000
Total unrecognized compensation costs		$ 297
TD Ameritrade [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining weighted-average period for unrecognized compensation cost	1 year 10 months 24 days
Employee stock purchase plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)		30,000,000
Stock option plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period from the date of grant in which stock options expire		10 years
Stock option plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		1 year
Stock option plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		4 years
Stock option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining weighted-average period for unrecognized compensation cost		8 months 12 days
Restricted stock unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining weighted-average period for unrecognized compensation cost		1 year 10 months 24 days
Total fair value of restricted stock awards vested		$ 317	$ 175	$ 123
Restricted stock unit [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		1 year
Restricted stock unit [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		4 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining weighted-average period for unrecognized compensation cost		6 months