v3.26.3
INVESTMENTS - Net Unrealized Gain (Losses) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]        
Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance $ 858 $ 2,605 $ 1,466 $ 3,423
Net unrealized gains (losses) on investments (2,326) 1,672 (3,014) 2,699
Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance (181) 1,604 (181) 1,604
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 (5,815) (6,722) (4,944) (8,074)
Net investment gains (losses) arising during the period (2,946) 685 (3,849) 1,995
Included in net income (loss) 27 1,136 70 1,180
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 (8,740) (4,902) (8,740) (4,902)
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 22 66 24 71
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) 11 (41) 9 (46)
Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance 33 25 33 25
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 184 140 10 464
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 (20) 231 (28) 190
Impact of net unrealized investment gains (losses) 611 (373) 792 (657)
Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance 776 (2) 776 (2)
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 (5,609) (6,516) (4,910) (7,539)
Net investment gains (losses) arising during the period (2,946) 685 (3,849) 1,995
Included in net income (loss) 27 1,136 70 1,180
Excluded from net income (loss) 0 0 0  
Other (20) 231 (28) 190
Impact of net unrealized investment gains (losses) 622 (414) 801 (703)
Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance (7,931) (4,879) (7,931) (4,879)
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 gains (losses) on investments (8,734) (4,901) (8,723) (4,899)
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 gains (losses) on investments 33 25 33 25
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 gains (losses) on investments 775 (2) 774 (3)
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 gains (losses) on investments (7,926) (4,878) (7,916) (4,877)
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 gains (losses) on investments (6) (1) (17) (3)
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 gains (losses) on investments 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 gains (losses) on investments 1 0 2 1
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 gains (losses) on investments $ (5) $ (1) $ (15) $ (2)