SUBSEQUENT EVENTS - Schedule of Senior Notes and Junior Subordinated Debt (Details) $ in Millions, $ in Billions	Oct. 06, 2026 USD ($)	Sep. 26, 2026 CAD ($)	Sep. 26, 2026 USD ($)
Senior Notes
Subsequent Event [Line Items]
Par Value (In millions)		$ 1.5	$ 1,100
Subsequent Event | Senior Notes | Senior Notes Due 2029
Subsequent Event [Line Items]
Par Value (In millions)	$ 1,750
Coupon rate	5.45%
Pricing (percentage of par)	99.989%
Subsequent Event | Senior Notes | Senior Notes Due 2031
Subsequent Event [Line Items]
Par Value (In millions)	$ 2,000
Coupon rate	5.60%
Pricing (percentage of par)	99.927%
Subsequent Event | Senior Notes | Senior Notes Due 2033
Subsequent Event [Line Items]
Par Value (In millions)	$ 1,500
Coupon rate	5.80%
Pricing (percentage of par)	99.841%
Subsequent Event | Senior Notes | Senior Notes Due 2036
Subsequent Event [Line Items]
Par Value (In millions)	$ 2,000
Coupon rate	5.95%
Pricing (percentage of par)	99.654%
Subsequent Event | Senior Notes | Senior Notes Due 2046
Subsequent Event [Line Items]
Par Value (In millions)	$ 1,000
Coupon rate	6.40%
Pricing (percentage of par)	99.476%
Subsequent Event | Senior Notes | Senior Notes Due 2056
Subsequent Event [Line Items]
Par Value (In millions)	$ 1,750
Coupon rate	6.50%
Pricing (percentage of par)	99.856%
Subsequent Event | Senior Notes | Senior Notes Due 2066
Subsequent Event [Line Items]
Par Value (In millions)	$ 750
Coupon rate	6.60%
Pricing (percentage of par)	99.846%
Subsequent Event | Junior Subordinated Debt | Series A Note
Subsequent Event [Line Items]
Par Value (In millions)	$ 1,500
Coupon rate	7.10%
Pricing (percentage of par)	100.00%
Subsequent Event | Junior Subordinated Debt | Series B Note
Subsequent Event [Line Items]
Par Value (In millions)	$ 1,000
Coupon rate	7.25%
Pricing (percentage of par)	100.00%
Subsequent Event | Junior Subordinated Debt | Series C Note
Subsequent Event [Line Items]
Par Value (In millions)	$ 1,400
Coupon rate	7.35%
Pricing (percentage of par)	100.00%