Commitments and Guarantees (Reinsurance Agreements Exposure and Reserves) (Details) (Reinsurance Agreements [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Loss Contingencies [Line Items]
Maximum Exposure	$ 4,342	$ 5,335
Excess of Loss - Mortgage Insurance	1.00%	2.00%
Quota Share	99.00%	98.00%
Reserves, Beginning balance	32	61
Paid Losses	(20)	(45)
Net Provision	11us-gaap_LossContingencyAccrualProvision	16us-gaap_LossContingencyAccrualProvision
Changes to Agreements	(10)
Reserves, Ending balance	13	32
Accidental Death and Dismemberment [Member]
Loss Contingencies [Line Items]
Maximum Exposure	1,774	1,902
Credit Life, Accident and Health [Member]
Loss Contingencies [Line Items]
Maximum Exposure	467	621
Lender Placed Hazard [Member]
Loss Contingencies [Line Items]
Maximum Exposure	2,056	2,679
Borrower and Lender Paid Mortgage Insurance [Member]
Loss Contingencies [Line Items]
Maximum Exposure	45	133
Maximum Exposure to Quota Share Agreemens with 100% Reinsurance
Loss Contingencies [Line Items]
Maximum Exposure	$ 466	$ 620

Impact of changes to agreements on reinsurance reserves.

No definition available.

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- Definition

Percentage of reinsurance agreements - excess of loss.

+ References

No definition available.

+ Details

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- Definition

Percentage of reinsurance agreements - quota share.

+ References

No definition available.

+ Details

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

+ Details

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- Details

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- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

+ Details

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- Definition

Amount of payments made reducing loss contingency liability.

+ References

+ Details

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- Definition

Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

+ References

+ Details

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