SIGNIFICANT ACCOUNTING POLICIES - INVESTMENTS AND MORTGAGE LOANS ON REAL ESTATE (Details) $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($) Rate	Dec. 31, 2016 USD ($)
Mortgage Loans on Real Estate, Write-down or Reserve, Management Judgment Factor [Line Items]
Carrying value of COLI	$ 911	$ 892
Loan-to-Value Ratio for Allowance to be Recommended \| Rate	100.00%
Debt Service Coverage Ratio Threshold	1.0
Minimum
Mortgage Loans on Real Estate, Write-down or Reserve, Management Judgment Factor [Line Items]
Lease Expiration Period	12 months
Mortgage Loan Maturity Period for Monitoring	12 months
Maximum
Mortgage Loans on Real Estate, Write-down or Reserve, Management Judgment Factor [Line Items]
Lease Expiration Period	36 months
Mortgage Loan Maturity Period for Monitoring	24 months
Commercial Real Estate Portfolio Segment
Mortgage Loans on Real Estate, Write-down or Reserve, Management Judgment Factor [Line Items]
Recorded Investment, Nonaccrual Status	$ 19	$ 34
Real estate held for the production of income \| Minimum
Mortgage Loans on Real Estate, Write-down or Reserve, Management Judgment Factor [Line Items]
Real estate held for the production of income, useful lives	40 years
Real estate held for the production of income \| Maximum
Mortgage Loans on Real Estate, Write-down or Reserve, Management Judgment Factor [Line Items]
Real estate held for the production of income, useful lives	50 years

Financing Receivable, Debt Service Coverage Ratio Threshold

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Financing Receivable, Lease Expiration Period

+ References

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- Definition

Financing Receivable, Loan-to-Value Ratio for Allowance to be Recommended

+ References

No definition available.

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- Definition

Financing Receivable, Mortgage Loan Maturity Period for Monitoring

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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.

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No definition available.

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- Definition

Recorded investment in financing receivables that are on nonaccrual status as of 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 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5111-111524

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- Definition

This item represents the amount that could be realized under a life insurance contract or contracts owned by the Entity as of the date of the statement of financial position. Such Entity-owned life insurance policies are commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 30
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6384206&loc=d3e41899-111602

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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