FAIR VALUE DISCLOSURES - LEVEL 3 INSTRUMENTS FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Millions |
3 Months Ended |
12 Months Ended |
Mar. 31, 2015 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Total Gains Losses Realized Unrealized Included In [Abstract] |
|
|
|
|
| Investment Gains (Losses), Net |
|
$ (4)
|
$ (1)
|
$ (6)
|
| Transfers into level 3 |
$ 1
|
|
|
|
| Level 3 Assets And Liabilities Still Held |
|
|
|
|
| Total Gains Losses Realized Unrealized Included In [Abstract] |
|
|
|
|
| Other Comprehensive Income (Loss) |
|
1
|
7
|
|
| Corporate | Level 3 |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Opening Balance |
8
|
8
|
8
|
9
|
| Total Gains Losses Realized Unrealized Included In [Abstract] |
|
|
|
|
| Investment Gains (Losses), Net |
|
0
|
0
|
(1)
|
| Other Comprehensive Income (Loss) |
|
0
|
0
|
1
|
| Sales |
|
(1)
|
(1)
|
(1)
|
| Closing Balance |
|
7
|
8
|
8
|
| Corporate | Level 3 Assets And Liabilities Still Held |
|
|
|
|
| Total Gains Losses Realized Unrealized Included In [Abstract] |
|
|
|
|
| Other Comprehensive Income (Loss) |
|
|
(1)
|
|
| Commercial Mortgage-backed | Level 3 |
|
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
|
|
|
| Opening Balance |
$ 26
|
31
|
26
|
24
|
| Total Gains Losses Realized Unrealized Included In [Abstract] |
|
|
|
|
| Investment Gains (Losses), Net |
|
(4)
|
(2)
|
(11)
|
| Other Comprehensive Income (Loss) |
|
1
|
8
|
13
|
| Sales |
|
(4)
|
(1)
|
0
|
| Closing Balance |
|
24
|
31
|
$ 26
|
| Commercial Mortgage-backed | Level 3 Assets And Liabilities Still Held |
|
|
|
|
| Total Gains Losses Realized Unrealized Included In [Abstract] |
|
|
|
|
| Other Comprehensive Income (Loss) |
|
1
|
$ 8
|
|
| Contingent Payment Arrangements | Level 3 |
|
|
|
|
| Total Gains Losses Realized Unrealized Included In [Abstract] |
|
|
|
|
| Purchases |
|
7
|
|
|
| Closing Balance |
|
$ 7
|
|
|