Commitments and Guarantees (Reinsurance Agreements Exposure and Reserves) (Details) (Reinsurance Agreements [Member], USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Loss Contingencies [Line Items]
Maximum Exposure	$ 4,952		$ 5,335
Excess of Loss - Mortgage Insurance	1.00%		2.00%
Quota Share	99.00%		98.00%
Reserves, Beginning balance	32	61
Paid Losses	(12)	(21)
Net Provision	6	8
Changes to Agreements	(10)
Reserves, Ending balance	16	48
Accidental Death and Dismemberment [Member]
Loss Contingencies [Line Items]
Maximum Exposure	1,835		1,902
Credit Life, Accident and Health [Member]
Loss Contingencies [Line Items]
Maximum Exposure	537		621
Lender Placed Hazard [Member]
Loss Contingencies [Line Items]
Maximum Exposure	2,530		2,679
Borrower and Lender Paid Mortgage Insurance [Member]
Loss Contingencies [Line Items]
Maximum Exposure	50		133
Maximum Exposure to Quota Share Agreemens with 100% Reinsurance
Loss Contingencies [Line Items]
Maximum Exposure	$ 536		$ 620