HELD-FOR-SALE CLASSIFICATION (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Aug. 15, 2016	Dec. 31, 2015
Held-for-Sale Classification
Net income (loss) on sale of properties and divested businesses	$ (100,000,000)	$ (2,000,000)
Assets:
Mortgage and other loans receivable, net	33,878,000,000		$ 33,240,000,000
Other invested assets	23,652,000,000		24,538,000,000
Short-term investments	11,073,000,000		12,302,000,000
Cash	1,918,000,000	1,499,000,000	1,868,000,000		$ 1,629,000,000
Accrued investment income	2,386,000,000		2,495,000,000
Premiums and other receivables, net of allowance	11,130,000,000		10,465,000,000
Reinsurance assets, net of allowance	34,140,000,000		21,901,000,000
Deferred policy acquisition costs	11,091,000,000		11,042,000,000
Other assets	10,606,000,000		10,815,000,000
Total assets held for sale	6,588,000,000		7,199,000,000
Liabilities:
Liability for unpaid losses and loss adjustment expenses	76,050,000,000	$ 73,946,000,000	77,077,000,000		$ 74,942,000,000
Unearned premiums	19,840,000,000		19,634,000,000
Future policy benefits for life and accident and health insurance contracts	42,719,000,000		42,204,000,000
Other policyholder funds	3,719,000,000		3,989,000,000
Long-term Debt	30,747,000,000		30,912,000,000
Other Liabilities	28,093,000,000		26,296,000,000
Total liabilities held for sale	5,771,000,000		6,106,000,000
Held for sale [Member]
Assets:
Fixed maturity securities	5,438,000,000		6,045,000,000
Equity Securities	14,000,000		149,000,000
Mortgage and other loans receivable, net	121,000,000		137,000,000
Other invested assets	244,000,000		2,000,000
Short-term investments	181,000,000		130,000,000
Cash	81,000,000		133,000,000
Accrued investment income	22,000,000		21,000,000
Premiums and other receivables, net of allowance	393,000,000		351,000,000
Reinsurance assets, net of allowance	13,000,000		8,000,000
Deferred policy acquisition costs	422,000,000		471,000,000
Other assets	264,000,000		273,000,000
Assets of businesses held for sale	7,193,000,000		7,720,000,000
Less: Loss Accrual	(605,000,000)		(521,000,000)
Total assets held for sale	6,588,000,000		7,199,000,000
Liabilities:
Liability for unpaid losses and loss adjustment expenses	489,000,000		402,000,000
Unearned premiums	333,000,000		297,000,000
Future policy benefits for life and accident and health insurance contracts	4,140,000,000		4,579,000,000
Other policyholder funds	327,000,000		378,000,000
Long-term Debt	108,000,000		0
Other Liabilities	374,000,000		450,000,000
Total liabilities held for sale	5,771,000,000		6,106,000,000
United Guaranty | Held for sale [Member]
Held-for-Sale Classification
Voting interest in subsidiary, Percent				100.00%
Total consideration			3,300,000,000
Consideration in cash			2,200,000,000
Non-cash consideration received from sale			1,100,000,000
Cash consideration retained by buyer			40,000,000
Pre-closing dividends			$ 261,000,000
Certain insurance operations | Held for sale [Member]
Held-for-Sale Classification
Consideration in cash	$ 234,000,000