Segment Information (Total Assets) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total assets	$ 186,744	$ 184,796
Retail [Member]
Segment Reporting Information [Line Items]
Total assets	143,426	136,333
Corporate Benefit Funding [Member]
Segment Reporting Information [Line Items]
Total assets	31,576	33,140
Corporate & Other [Member]
Segment Reporting Information [Line Items]
Total assets	$ 11,742	$ 15,323