Financial Instruments Subject to Off-Balance Sheet Credit Risk or Concentration Risk (Offsetting Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Financial Instruments Subject to Off-Balance Sheet Credit Risk or Concentration Risk [Abstract]
Resale agreements, Gross Asset	$ 10,186	[1]	$ 14,016	[1]
Resale agreements, Net Amounts Presented in the Consolidated Balance Sheet	10,186	[1]	14,016	[1]
Resale agreements, Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral	(10,186)	[1],[2]	(14,016)	[1],[2]
Resale agreements, Net Amount	0	[1]	0	[1]
Securities borrowed, Gross Asset	187	[3]	349	[3]
Securities borrowed, Net Amounts Presented in the Consolidated Balance Sheet	187	[3]	349	[3]
Securities borrowed, Gross Amounts Not Offset in the Consolidated Balance Sheet, Counterparty Offsetting	(69)	[3]	(88)	[3]
Securities borrowed, Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral	(117)	[3]	(257)	[3]
Securities borrowed, Net Amount	1	[3]	4	[3]
Total Gross Assets	10,373		14,365
Total Assets, Net Amounts Presented in the Consolidated Balance Sheet	10,373		14,365
Total Assets, Gross Amounts Not Offset in the Consolidated Balance Sheet, Counterparty Offsetting	(69)		(88)
Total Assets, Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral	(10,303)		(14,273)
Total Assets, Net Amount	$ 1		$ 4

[1] Included in cash and investments segregated and on deposit for regulatory purposes in the Company’s consolidated balance sheets.

[2] Actual collateral was greater than 102% of the related assets.

[3] Included in receivables from brokers, dealers, and clearing organizations in the Company’s consolidated balance sheets.