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Borrowings (Long-term Debt Including Unamortized Debt Discounts and Premiums) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Oct. 06, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Senior Notes $ 9,881   $ 7,481
Finance lease obligation 6   0
Unamortized premium/(discount) — net 249   (14)
Debt issuance costs (54)   (37)
Total long-term debt [1] 13,632   7,430
Senior Notes [Member] | TD Ameritrade [Member]      
Debt Instrument [Line Items]      
Senior Notes $ 3,550 $ 3,600  
Senior Notes [Member] | Senior Notes Due 2020 [Member]      
Debt Instrument [Line Items]      
Fixed Interest Rate 4.45%    
Senior Notes $ 0   700
Senior Notes [Member] | Senior Notes Due 2021 [Member]      
Debt Instrument [Line Items]      
Fixed Interest Rate 3.25%    
Senior Notes $ 600   600
Senior Notes [Member] | Senior Notes Due 2022 [Member]      
Debt Instrument [Line Items]      
Fixed Interest Rate 3.225%    
Senior Notes $ 256   256
Senior Notes [Member] | Senior Notes Due 2022 [Member] | TD Ameritrade [Member]      
Debt Instrument [Line Items]      
Fixed Interest Rate 2.95%    
Senior Notes $ 750    
Senior Notes [Member] | Senior Notes Due 2023 [Member]      
Debt Instrument [Line Items]      
Fixed Interest Rate 2.65%    
Senior Notes $ 800   800
Senior Notes [Member] | Senior Notes Due 2024 [Member]      
Debt Instrument [Line Items]      
Fixed Interest Rate 3.55%    
Senior Notes $ 500   500
Senior Notes [Member] | Senior Notes Due 2024 [Member] | TD Ameritrade [Member]      
Debt Instrument [Line Items]      
Fixed Interest Rate 3.75%    
Senior Notes $ 400    
Senior Notes [Member] | Senior Notes Due 2025 [Member]      
Debt Instrument [Line Items]      
Fixed Interest Rate 3.00%    
Senior Notes $ 375   375
Senior Notes [Member] | Senior Notes Due 2025 [Member] | TD Ameritrade [Member]      
Debt Instrument [Line Items]      
Fixed Interest Rate 3.625%    
Senior Notes $ 500    
Senior Notes [Member] | Senior Notes Due March 2025 [Member]      
Debt Instrument [Line Items]      
Fixed Interest Rate 4.20%    
Senior Notes $ 600   0
Senior Notes [Member] | Senior Notes Due May 2025 [Member]      
Debt Instrument [Line Items]      
Fixed Interest Rate 3.85%    
Senior Notes $ 750   750
Senior Notes [Member] | Senior Notes Due 2026 [Member]      
Debt Instrument [Line Items]      
Fixed Interest Rate 3.45%    
Senior Notes $ 350   350
Senior Notes [Member] | Senior Notes Due March 2026 [Member]      
Debt Instrument [Line Items]      
Fixed Interest Rate 0.90%    
Senior Notes $ 1,250   0
Senior Notes [Member] | Senior Notes Due 2027 [Member]      
Debt Instrument [Line Items]      
Fixed Interest Rate 3.20%    
Senior Notes $ 650   650
Senior Notes [Member] | Senior Notes Due 2027 [Member] | TD Ameritrade [Member]      
Debt Instrument [Line Items]      
Fixed Interest Rate 3.30%    
Senior Notes $ 800    
Senior Notes [Member] | Senior Notes Due 2028 [Member]      
Debt Instrument [Line Items]      
Fixed Interest Rate 3.20%    
Senior Notes $ 700   700
Senior Notes [Member] | Senior Notes Due 2029 [Member]      
Debt Instrument [Line Items]      
Fixed Interest Rate 4.00%    
Senior Notes $ 600   600
Senior Notes [Member] | Senior Notes Due 2029 [Member] | TD Ameritrade [Member]      
Debt Instrument [Line Items]      
Fixed Interest Rate 2.75%    
Senior Notes $ 500    
Senior Notes [Member] | Senior Notes Due 2030 [Member]      
Debt Instrument [Line Items]      
Fixed Interest Rate 4.625%    
Senior Notes $ 500   0
Senior Notes [Member] | Senior Notes Due May 2029 [Member]      
Debt Instrument [Line Items]      
Fixed Interest Rate 3.25%    
Senior Notes $ 600   600
Senior Notes [Member] | Senior Notes Due 2031 [Member]      
Debt Instrument [Line Items]      
Fixed Interest Rate 1.65%    
Senior Notes $ 750   0
Senior Notes [Member] | Floating Rate Senior Notes Due 2021 [Member]      
Debt Instrument [Line Items]      
Senior Notes $ 600   $ 600
Senior Notes [Member] | Floating Rate Senior Notes Due 2021 [Member] | TD Ameritrade [Member]      
Debt Instrument [Line Items]      
Basis spread 0.43%    
Senior Notes $ 600    
Senior Notes [Member] | Floating Rate Senior Notes Due 2021 [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Basis spread 0.32%    
[1] Certain prior year amounts have been reclassified to conform to the current year presentation. See Note 1 for additional information.