Offsetting Assets and Liabilities (Offsetting Assets) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Offsetting Assets and Liabilities [Abstract]
Resale agreements, Gross Asset	$ 9,806	[1]	$ 10,186	[1]
Resale agreements, Net Amounts Presented in the Consolidated Balance Sheet	9,806	[1]	10,186	[1]
Resale agreements, Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral	(9,806)	[1],[2]	(10,186)	[1],[2]
Resale agreements, Net Amount	0	[1]	0	[1]
Securities borrowed, Gross Asset	167	[3]	187	[3]
Securities borrowed, Net Amounts Presented in the Consolidated Balance Sheet	167	[3]	187	[3]
Securities borrowed, Gross Amounts Not Offset in the Consolidated Balance Sheet, Counterparty Offsetting	(40)	[3]	(69)	[3]
Securities borrowed, Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral	(126)	[3]	(117)	[3]
Securities borrowed, Net Amount	1	[3]	1	[3]
Total Gross Assets	9,973		10,373
Total Assets, Net Amounts Presented in the Consolidated Balance Sheet	9,973		10,373
Total Assets, Gross Amounts Not Offset in the Consolidated Balance Sheet, Counterparty Offsetting	(40)		(69)
Total Assets, Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral	(9,932)		(10,303)
Total Assets, Net Amount	$ 1		$ 1

[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.