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INVESTMENTS - Net Unrealized Gain (Losses) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]        
Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance $ 2,605 $ 3,339 $ 3,423 $ 4,375
Net unrealized investment gains (losses) 1,672 2,322 2,699 1,357
Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance 1,604 4,956 1,604 4,956
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains (Losses), All Other | Net Unrealized Gains (Losses) on Investments        
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]        
Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance (6,722) (8,214) (8,074) (6,999)
Net investment gains (losses) arising during the period 685 2,759 1,995 1,521
Included in net income (loss) 1,136 28 1,180 54
Excluded from net income (loss) 0 0 0  
Other 0 0 0 0
Impact of net unrealized investment gains (losses) 0 0 0 0
Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance (4,902) (5,432) (4,902) (5,432)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains (Losses), All Other | Policyholders’ Liabilities        
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]        
Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance 66 67 71 50
Net investment gains (losses) arising during the period 0 0 0 0
Included in net income (loss) 0 0 0 0
Excluded from net income (loss) 0 0 0  
Other 0 0 0 0
Impact of net unrealized investment gains (losses) (41) (17) (46) 0
Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance 25 50 25 50
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains (Losses), All Other | Deferred Income Tax Asset (Liability)        
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]        
Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance 140 471 464 226
Net investment gains (losses) arising during the period 0 0 0 0
Included in net income (loss) 0 0 0 0
Excluded from net income (loss) 0 0 0  
Other 231 120 190 113
Impact of net unrealized investment gains (losses) (373) (582) (657) (331)
Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance (2) 10 (2) 10
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains (Losses), All Other | AOCI Gain (Loss) Related to Net Unrealized Investment Gains (Losses)        
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]        
Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance (6,516) (7,676) (7,539) (6,723)
Net investment gains (losses) arising during the period 685 2,759 1,995 1,521
Included in net income (loss) 1,136 28 1,180 54
Excluded from net income (loss) 0 0 0  
Other 231 120 190 113
Impact of net unrealized investment gains (losses) (414) (599) (703) (331)
Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance (4,879) (5,372) (4,879) (5,372)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Net unrealized investment gains (losses) excluding credit losses | Net Unrealized Gains (Losses) on Investments        
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]        
Net unrealized investment gains (losses) (4,901) (5,427) (4,899) (5,424)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Net unrealized investment gains (losses) excluding credit losses | Policyholders’ Liabilities        
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]        
Net unrealized investment gains (losses) 25 50 25 50
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Net unrealized investment gains (losses) excluding credit losses | Deferred Income Tax Asset (Liability)        
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]        
Net unrealized investment gains (losses) (2) 9 (3) 8
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Net unrealized investment gains (losses) excluding credit losses | AOCI Gain (Loss) Related to Net Unrealized Investment Gains (Losses)        
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]        
Net unrealized investment gains (losses) (4,878) (5,368) (4,877) (5,366)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Net unrealized investment gains (losses) with credit losses | Net Unrealized Gains (Losses) on Investments        
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]        
Net unrealized investment gains (losses) (1) (5) (3) (8)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Net unrealized investment gains (losses) with credit losses | Policyholders’ Liabilities        
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]        
Net unrealized investment gains (losses) 0 0 0 0
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Net unrealized investment gains (losses) with credit losses | Deferred Income Tax Asset (Liability)        
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]        
Net unrealized investment gains (losses) 0 1 1 2
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Net unrealized investment gains (losses) with credit losses | AOCI Gain (Loss) Related to Net Unrealized Investment Gains (Losses)        
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]        
Net unrealized investment gains (losses) $ (1) $ (4) $ (2) $ (6)