Fair Values of Assets and Liabilities (Fair Value Hierarchy for Financial Instruments Not Recorded at Fair Value) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Jun. 30, 2014	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Assets:
Securities held to maturity	$ 33,939			$ 29,490
Liabilities:
Allowance for loan losses	40		41	48		52	57	56
Residential real estate mortgages [Member]
Liabilities:
Allowance for loan losses	28		28	34		34	40	36
Home equity lines of credit [Member]
Liabilities:
Allowance for loan losses	12		13	14		18	17	20
Carrying Amount [Member]
Assets:
Cash and cash equivalents	6,865			6,565
Cash and investments segregated and on deposit for regulatory purposes	16,111			18,273
Receivables from brokers, dealers, and clearing organizations	458			509
Receivables from brokerage clients - net	15,413			13,949
Securities held to maturity	34,007			30,318
Loans to banking clients	13,120	[1]		12,467	[2]
Other assets	75	[1]		64
Total	86,049			82,145
Liabilities:
Deposits from banking clients	97,345			92,972
Payables to brokers, dealers, and clearing organizations	2,099			1,467
Payables to brokerage clients	33,131			35,333
Accrued expenses and other liabilities	471			680
Long-term debt	1,900			1,903
Total	134,946			132,355
Carrying Amount [Member] | Residential real estate mortgages [Member]
Assets:
Loans to banking clients	8,075	[1]		8,006	[2]
Carrying Amount [Member] | Home equity lines of credit [Member]
Assets:
Loans to banking clients	2,982	[1]		3,041	[2]
Carrying Amount [Member] | Personal loans secured by securities [Member]
Assets:
Loans to banking clients	2,033	[1]		1,384	[2]
Carrying Amount [Member] | Other [Member]
Assets:
Loans to banking clients	30	[1]		36	[2]
Carrying Amount [Member] | U.S. agency mortgage-backed securities [Member]
Assets:
Securities held to maturity	33,005			29,260
Carrying Amount [Member] | Non-agency commercial mortgage-backed securities [Member]
Assets:
Securities held to maturity	1,002			958
Carrying Amount [Member] | Other securities [Member]
Assets:
Securities held to maturity				100
Fair Value [Member]
Assets:
Cash and cash equivalents	6,865			6,565
Cash and investments segregated and on deposit for regulatory purposes	16,111			18,273
Receivables from brokers, dealers, and clearing organizations	458			509
Receivables from brokerage clients - net	15,413			13,949
Securities held to maturity	33,939			29,490
Loans to banking clients	13,164	[1]		12,392	[2]
Other assets	75	[1]		64
Total	86,025			81,242
Liabilities:
Deposits from banking clients	97,345			92,972
Payables to brokers, dealers, and clearing organizations	2,099			1,467
Payables to brokerage clients	33,131			35,333
Accrued expenses and other liabilities	471			680
Long-term debt	2,012			1,989
Total	135,058			132,441
Fair Value [Member] | Residential real estate mortgages [Member]
Assets:
Loans to banking clients	8,056	[1]		7,930	[2]
Fair Value [Member] | Home equity lines of credit [Member]
Assets:
Loans to banking clients	3,046	[1]		3,043	[2]
Fair Value [Member] | Personal loans secured by securities [Member]
Assets:
Loans to banking clients	2,033	[1]		1,384	[2]
Fair Value [Member] | Other [Member]
Assets:
Loans to banking clients	29	[1]		35	[2]
Fair Value [Member] | U.S. agency mortgage-backed securities [Member]
Assets:
Securities held to maturity	32,964			28,500
Fair Value [Member] | Non-agency commercial mortgage-backed securities [Member]
Assets:
Securities held to maturity	975			890
Fair Value [Member] | Other securities [Member]
Assets:
Securities held to maturity				100
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Cash and cash equivalents	6,865			6,565
Cash and investments segregated and on deposit for regulatory purposes	16,111			18,273
Receivables from brokers, dealers, and clearing organizations	458			509
Receivables from brokerage clients - net	15,413			13,949
Securities held to maturity	33,939			29,490
Loans to banking clients	13,164	[1]		12,392	[2]
Other assets	75	[1]		64
Total	86,025			81,242
Liabilities:
Deposits from banking clients	97,345			92,972
Payables to brokers, dealers, and clearing organizations	2,099			1,467
Payables to brokerage clients	33,131			35,333
Accrued expenses and other liabilities	471			680
Long-term debt	2,012			1,989
Total	135,058			132,441
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Residential real estate mortgages [Member]
Assets:
Loans to banking clients	8,056	[1]		7,930	[2]
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Home equity lines of credit [Member]
Assets:
Loans to banking clients	3,046	[1]		3,043	[2]
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Personal loans secured by securities [Member]
Assets:
Loans to banking clients	2,033	[1]		1,384	[2]
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other [Member]
Assets:
Loans to banking clients	29	[1]		35	[2]
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. agency mortgage-backed securities [Member]
Assets:
Securities held to maturity	32,964			28,500
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Non-agency commercial mortgage-backed securities [Member]
Assets:
Securities held to maturity	975			890
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other securities [Member]
Assets:
Securities held to maturity				$ 100

[1] The carrying value of loans to banking clients excludes the allowance for loan losses of $40 million at September 30, 2014.

[2] The carrying value of loans to banking clients excludes the allowance for loan losses of $48 million at December 31, 2013.