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Employee Incentive, Retirement, Deferred Compensation, and Career Achievement Plans (Restricted Stock Units Activity) (Details) - Restricted stock unit [Member]
shares in Thousands
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Number of Units  
Outstanding Beginning Balance (in shares) | shares 8,000
Converted TD Ameritrade restricted stock units (in shares) | shares 4,000
Granted (in shares) | shares 3,000
Vested (in shares) | shares (5,000)
Forfeited (in shares), less than | shares 500
Outstanding Ending Balance (in shares) | shares 10,000
Weighted- Average Grant Date Fair Value per Unit  
Outstanding Beginning Balance (USD per share) | $ / shares $ 42.93
Granted (USD per share) | $ / shares 39.26
Converted TD Ameritrade restricted stock units (USD per share) | $ / shares 36.94
Vested (USD per share) | $ / shares 39.78
Forfeited (USD per share) | $ / shares 41.13
Outstanding Ending Balance (USD per share) | $ / shares $ 40.85