Borrowings (Long-term Debt Including Unamortized Debt Discounts and Premiums) (Details) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($) debt_instrument	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Finance lease liabilities	$ 94	$ 6
Unamortized premium — net	180	249
Debt issuance costs	(91)	(54)
Total long-term debt	18,914	13,632
Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes	17,768	9,881
Senior Notes [Member] \| TD Ameritrade Holding [Member]
Debt Instrument [Line Items]
Total long-term debt	213
Aggregate principal amount of debt	$ 2,200
Number of senior notes \| debt_instrument	4
Senior Notes [Member] \| TD Ameritrade Holding [Member]
Debt Instrument [Line Items]
Senior notes	$ 963	3,550
Aggregate principal amount of debt	$ 2,000
Percentage of debt principal exchanged	90.00%
Senior Notes [Member] \| Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Fixed interest rate	3.25%
Senior notes	$ 0	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 Holding [Member]
Debt Instrument [Line Items]
Fixed interest rate	2.95%
Senior notes	$ 750	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 February 2024 [Member]
Debt Instrument [Line Items]
Fixed interest rate	3.55%
Senior notes	$ 500	500
Senior Notes [Member] \| Senior Notes Due March 2024 [Member]
Debt Instrument [Line Items]
Fixed interest rate	0.75%
Senior notes	$ 1,500	0
Senior Notes [Member] \| Senior Notes Due April 2024 [Member]
Debt Instrument [Line Items]
Fixed interest rate	3.75%
Senior notes	$ 350	0
Senior Notes [Member] \| Senior Notes Due April 2024 [Member] \| TD Ameritrade Holding [Member]
Debt Instrument [Line Items]
Fixed interest rate	3.75%
Senior notes	$ 50	400
Senior Notes [Member] \| Senior Notes Due March 10, 2025 [Member]
Debt Instrument [Line Items]
Fixed interest rate	3.00%
Senior notes	$ 375	375
Senior Notes [Member] \| Senior Notes Due March 24, 2025 [Member]
Debt Instrument [Line Items]
Fixed interest rate	4.20%
Senior notes	$ 600	600
Senior Notes [Member] \| Senior Notes Due April 2025 [Member]
Debt Instrument [Line Items]
Fixed interest rate	3.625%
Senior notes	$ 418	0
Senior Notes [Member] \| Senior Notes Due April 2025 [Member] \| TD Ameritrade Holding [Member]
Debt Instrument [Line Items]
Fixed interest rate	3.625%
Senior notes	$ 82	500
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 February 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	1,250
Senior Notes [Member] \| Senior Notes Due May 2026 [Member]
Debt Instrument [Line Items]
Fixed interest rate	1.15%
Senior notes	$ 1,000	0
Senior Notes [Member] \| Senior Notes Due March 2027 [Member]
Debt Instrument [Line Items]
Fixed interest rate	3.20%
Senior notes	$ 650	650
Senior Notes [Member] \| Senior Notes Due April 2027 [Member]
Debt Instrument [Line Items]
Fixed interest rate	3.30%
Senior notes	$ 744	0
Senior Notes [Member] \| Senior Notes Due April 2027 [Member] \| TD Ameritrade Holding [Member]
Debt Instrument [Line Items]
Fixed interest rate	3.30%
Senior notes	$ 56	800
Senior Notes [Member] \| Senior Notes Due January 2028 [Member]
Debt Instrument [Line Items]
Fixed interest rate	3.20%
Senior notes	$ 700	700
Senior Notes [Member] \| Senior Notes Due March 2028 [Member]
Debt Instrument [Line Items]
Fixed interest rate	2.00%
Senior notes	$ 1,250	0
Senior Notes [Member] \| Senior Notes Due February 2029 [Member]
Debt Instrument [Line Items]
Fixed interest rate	4.00%
Senior notes	$ 600	600
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 October 2029 [Member]
Debt Instrument [Line Items]
Fixed interest rate	2.75%
Senior notes	$ 475	0
Senior Notes [Member] \| Senior Notes Due October 2029 [Member] \| TD Ameritrade Holding [Member]
Debt Instrument [Line Items]
Fixed interest rate	2.75%
Senior notes	$ 25	500
Senior Notes [Member] \| Senior Notes Due 2030 [Member]
Debt Instrument [Line Items]
Fixed interest rate	4.625%
Senior notes	$ 500	500
Senior Notes [Member] \| Senior Notes Due March 2031 [Member]
Debt Instrument [Line Items]
Fixed interest rate	1.65%
Senior notes	$ 750	750
Senior Notes [Member] \| Senior Notes Due May 2031 [Member]
Debt Instrument [Line Items]
Fixed interest rate	2.30%
Senior notes	$ 750	0
Senior Notes [Member] \| Senior Notes Due December 2031 [Member]
Debt Instrument [Line Items]
Fixed interest rate	1.95%
Senior notes	$ 850	0
Senior Notes [Member] \| Floating Rate Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Senior notes	$ 0	600
Senior Notes [Member] \| Floating Rate Senior Notes Due 2021 [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Basis spread rate	0.32%
Senior Notes [Member] \| Floating Rate Senior Notes Due 2021 [Member] \| LIBOR [Member] \| TD Ameritrade Holding [Member]
Debt Instrument [Line Items]
Basis spread rate	0.43%
Senior Notes [Member] \| Floating Rate Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Senior notes	$ 1,250	0
Senior Notes [Member] \| Floating Rate Senior Notes Due 2024 [Member] \| SOFR [Member]
Debt Instrument [Line Items]
Basis spread rate	0.50%
Senior Notes [Member] \| Floating Rate Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Senior notes	$ 500	0
Senior Notes [Member] \| Floating Rate Senior Notes Due 2026 [Member] \| SOFR [Member]
Debt Instrument [Line Items]
Basis spread rate	0.52%
Senior Notes [Member] \| Various Rates Debt Due 2021 [Member] \| TD Ameritrade Holding [Member]
Debt Instrument [Line Items]
Senior notes	$ 0	$ 600

Debt Instrument, Exchange Offer, Percentage Of Principal Amount Transferred

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Number Of Debt Instruments

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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