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BORROWINGS - Corporate Borrowings (Details) $ in Millions, $ in Millions | Jun. 30, 2026 USD ($) | Dec. 31, 2025 USD ($) | Sep. 24, 2025 CAD ($) | May 16, 2025 CAD ($)
--- | --- | --- | --- | ---
Corporate revolving credit facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 700 | $ 0 |  |
Corporate revolving credit facility | Floating interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate | 1.20% |  |  |
Commercial paper |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 467 | 735 |  |
Commercial paper | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate | 4.10% |  |  |
Medium-term notes, maturing november 14, 2027 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 317 | 328 |  |
Medium-term notes, maturing november 14, 2027 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate | 5.60% |  |  |
Medium-term notes, maturing september 11, 2028 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 493 | 510 |  |
Medium-term notes, maturing september 11, 2028 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate | 4.20% |  |  |
Medium-term notes, maturing october 9, 2029 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 493 | 510 |  |
Medium-term notes, maturing october 9, 2029 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate | 3.40% |  |  |
Medium-term notes, maturing july 27, 2030 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 352 | 364 |  |
Medium-term notes, maturing july 27, 2030 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate | 5.70% |  |  |
Medium-term notes, maturing january 6, 2031 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 264 | 273 | $ 375 |
Medium-term notes, maturing january 6, 2031 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate | 3.70% |  | 3.70% |
Medium-term notes, maturing september 1, 2032 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 352 | 364 |  |
Medium-term notes, maturing september 1, 2032 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate | 2.90% |  |  |
Medium-term notes, maturing february 14, 2033 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 176 | 182 |  |
Medium-term notes, maturing february 14, 2033 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate | 6.00% |  |  |
Medium-term notes, maturing april 25, 2034 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 281 | 291 |  |
Medium-term notes, maturing april 25, 2034 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate | 5.40% |  |  |
Medium-term notes, maturing september 24, 2035 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 229 | 237 | $ 325 |
Medium-term notes, maturing september 24, 2035 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate | 4.50% |  | 4.50% |
Medium-term notes, maturing april 25, 2052 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 141 | 146 |  |
Medium-term notes, maturing april 25, 2052 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate | 5.80% |  |  |
Medium-term notes, maturing july 27, 2053 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 141 | 146 |  |
Medium-term notes, maturing july 27, 2053 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate | 6.00% |  |  |
Subordinated notes, maturing march 15, 2055 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 300 | 300 |  |
Subordinated notes, maturing march 15, 2055 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate | 6.80% |  |  |
Subordinated notes, maturing september 1, 2055 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 177 | 183 |  | $ 250
Subordinated notes, maturing september 1, 2055 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate | 5.60% |  |  | 5.60%
Subordinated notes, maturing may 24, 2081 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 250 | 250 |  |
Subordinated notes, maturing may 24, 2081 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate | 5.00% |  |  |
Subordinated notes, maturing may 31, 2084 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 158 | 158 |  |
Subordinated notes, maturing may 31, 2084 | Fixed interest rate |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Annual Rate | 7.30% |  |  |
Corporate borrowings |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Subsidiary and corporate borrowings | $ 5,263 | 4,947 |  |
Corporate borrowings, outstanding principal | 5,291 | 4,977 |  |
Corporate borrowings, deferred financing costs and other | $ (28) | $ (30) |  |

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