EQUITY - SHARE REPURCHASE PROGRAM (DETAILS) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2015 |
Dec. 31, 2014 |
May. 31, 2015 |
|
| Equity Disclosures | |||||
| Repurchase of common shares for the period | $ 300 | $ 300 | |||
| Common Shares | |||||
| Equity Disclosures | |||||
| Authorized amount of issued and outstanding common shares available for repurchase | $ 975 | $ 500 | |||
| Repurchase of common shares (in shares) | 1,411,210 | 2,460,600 | 3,871,810 | 3,780,987 | |
| Repurchase of common shares for the period | $ 200 | ||||
| Treasury Shares | |||||
| Equity Disclosures | |||||
| Repurchase of common shares for the period | $ 100 | $ 300 | $ 300 | ||