Fair Value, Investments in Entities That Calculate Net Asset Value Per Share (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2015	Dec. 31, 2014
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value	$ 1,047	$ 1,507
Unfunded commitments	201	252
Fair Value of nonmarketable equity investments in private equity funds where nonrecurring fair value adjustments were recorded	0	171
Fair Value of cost method NMEI funds using NAV	922	1,300
Fair Value of nonmarketable equity investments where net asset value was used	133	108
Offshore funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value	28	125
Unfunded commitments	$ 0	$ 0
Redemption frequency	Daily - Monthly	Daily - Quarterly
Alternative investments, assets with redemption restrictions, fair value disclosure	$ 0	$ 24
Offshore funds [Member] \| Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Redemption notice period	1 day	1 day
Offshore funds [Member] \| Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Redemption notice period	30 days	60 days
Hedge funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value	$ 1	$ 1
Unfunded commitments	$ 0	$ 0
Redemption frequency	Daily - Quarterly	Daily - Quarterly
Hedge funds [Member] \| Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Redemption notice period	1 day	1 day
Hedge funds [Member] \| Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Redemption notice period	90 days	90 days
Private equity funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value	$ 921	$ 1,313
Unfunded commitments	$ 192	243
Alternative investment, distributions from underlying assets, distribution period	6 years
Venture capital funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value	$ 97	68
Unfunded commitments	$ 9	$ 9
Investment fund liquidation period	4 years

Fair value of investments in certain entities that calculate net asset value per share, including, but not limited to, by unit, membership interest, or other ownership interest. Investments include, but are not limited to, investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 6A

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=SL6742756-110258

+ Details

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- Definition

Notice period the entity is required to deliver before it can redeem an investment calculated using net asset value per share, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, investments calculated by per unit, per membership interest, other equity or ownership interest and alternative investments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 6A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=SL6742756-110258

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 6A

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=SL6742756-110258

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- Definition

Alternative Investment, Distributions From Underlying Assets, Distribution Period

+ References

No definition available.

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- Definition

This element represents the total fair market value of investments in certain entities that calculate net asset value per share (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments), with redemption restrictions.

+ References

No definition available.

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- Definition

States the frequency (for example, annually, semi-annually, quarterly) with which the entity can redeem its investment, or portion thereof, for each of those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments), by major category.

+ References

No definition available.

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- Definition

Fair Value of nonmarketable equity investments in alternative investment funds using net asset value to evaluate whether nonrecurring fair value adjustments should be recorded in the current period.

+ References

No definition available.

+ Details

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- Definition

Fair Value of nonmarketable equity investments in private equity funds where nonrecurring fair value adjustments were recorded during the period and the funds have a probability of being sold for an amount different from the net asset value.

+ References

No definition available.

+ Details

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- Definition

Fair Value of nonmarketable equity investments where net asset value was used to record a nonrecurring fair value adjustment.

+ References

No definition available.

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- Definition

Liquidation period for investment fund

+ References

No definition available.

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