Financing Receivables (Credit Quality Information Text) (Details 2) $ in Millions	3 Months Ended
Sep. 30, 2017 USD ($) item	Dec. 31, 2016 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	$ 3,509	$ 3,492
90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonperforming loans	2	2
Commercial mortgage loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	$ 2,770	$ 2,702
Percentage of commercial mortgage loans with highest risk rating	1.00%	0.00%
Syndicated loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	$ 486	$ 482
Syndicated loans [Member] \| 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonperforming loans	2	1
Consumer loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	$ 253	$ 308
Percentage of consumer loans below specified FICO score	1.00%	2.00%
FICO score \| item	640
Percentage of consumer loans above specified LTV ratios	0.00%	0.00%
LTV ratio	90.00%
Percentage of loan portfolio represented by state of California	52.00%	52.00%
Percentage of loan portfolio represented by state of Colorado	18.00%	18.00%
Percentage of loan portfolio represented by state of Washington	13.00%	13.00%
Consumer loans, at cost	$ 258
Loss on consumer loans	$ 7

Represents the percentage of commercial mortgage loans that the company has assigned its highest risk rating.

No definition available.

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- Definition

Represents the percentage of total loan portfolio represented by California State.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage of total loan portfolio represented by Colorado State.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage of residential mortgage loans which are above specified Loan-To-Value ratios.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage of residential mortgage loans which are below specified FICO score.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage of total loan portfolio represented by Washington State.

+ References

No definition available.

+ Details

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- Definition

Represents the maximum specified FICO score used for analysis of credit worthiness of borrowers.

+ References

No definition available.

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- Definition

Represents the minimum specified Loan-To-Value ratio used for analysis of collateral characteristics.

+ References

No definition available.

+ Details

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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

Recorded Investment in financing receivables that are past due at the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953401-111524

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (c)-(e)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(c),9(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27405-111563

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Balance Type:	credit
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- Definition

Amount before allowance of consumer real estate loans. Includes, but not limited to, construction financing, residential mortgage loans, and home equity lines of credit. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(a)(2),(3),(b))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

+ Details

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- Definition

Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

+ References

+ Details

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- Details

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