PREFERRED SHARES REDEEMABLE NON-CONTROLLING INTEREST - Schedule of Preferred Shares (Details) - USD ($) $ in Millions	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Redeemable Noncontrolling Interest [Line Items]
Preferred shares redeemable non-controlling interest	$ 1,238	$ 1,265	$ 1,398	$ 1,859	$ 1,930	$ 2,103
Subsidiaries
Redeemable Noncontrolling Interest [Line Items]
Preferred shares redeemable non-controlling interest	$ 1,442	$ 1,384	$ 0	$ 0	$ 0	$ 0
BUSHI Tracking Shares
Redeemable Noncontrolling Interest [Line Items]
Number of Shares	200,000,000		200,000,000
Preferred shares redeemable non-controlling interest	$ 943		$ 1,115
Class B senior preferred
Redeemable Noncontrolling Interest [Line Items]
Number of Shares	1,621,093,000,000		1,621,093,000,000
Preferred shares redeemable non-controlling interest	$ 41		$ 41
Class B preferred
Redeemable Noncontrolling Interest [Line Items]
Number of Shares	2,520,571,000,000		2,520,571,000,000
Preferred shares redeemable non-controlling interest	$ 63		$ 63
Class A preferred
Redeemable Noncontrolling Interest [Line Items]
Number of Shares	5,909,372,000,000		5,909,372,000,000
Preferred shares redeemable non-controlling interest	$ 148		$ 148
BMHL Tracking Shares
Redeemable Noncontrolling Interest [Line Items]
Number of Shares	100,000,000		100,000,000
Preferred shares redeemable non-controlling interest	$ 43		$ 31
Class B-1 and E-1
Redeemable Noncontrolling Interest [Line Items]
Number of Shares	2,983,179
Class B-1 and E-1 \| Subsidiaries
Redeemable Noncontrolling Interest [Line Items]
Number of Shares	43,488,677,000,000
Preferred shares redeemable non-controlling interest	$ 1,064
Class B-2, Class E-2 and Investor Units \| Subsidiaries
Redeemable Noncontrolling Interest [Line Items]
Number of Shares	13,041,071,000,000
Preferred shares redeemable non-controlling interest	$ 378