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Accumulated Other Comprehensive Income (Loss) by Component (Schedule of Accumulated Other Comprehensive Income (Loss) by Component) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Total stockholder's equity at beginning of period $ 9,893 $ 8,548    
Other comprehensive income (loss) before reclassifications 284 827 $ (2,383)  
Amounts reclassified from accumulated other comprehensive income (loss) net of tax (397) (99) (145)  
Other comprehensive income (loss) after tax (expense) benefit 681 926 (2,238)  
Total stockholder's equity at end of period 10,513 9,893 8,548  
Cumulative effect adjustments from changes in accounting guidance, tax     11 $ 446
Reclassification from AOCI, tax 106 26 26  
Tax (expense) benefit on other comprehensive income (loss) (210) (235) 568  
Accumulated other comprehensive income (loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Total stockholder's equity at beginning of period (2,672) (3,598) (1,360)  
Total stockholder's equity at end of period (1,991) (2,672) (3,598) (1,360)
Accumulated other comprehensive income (loss) | Previously Reported        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Total stockholder's equity at beginning of period (2,672) (3,557) 320  
Total stockholder's equity at end of period   (2,672) (3,557) 320
Accumulated other comprehensive income (loss) | Revision of Prior Period, Accounting Standards Update, Adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Total stockholder's equity at beginning of period 0 (41) (1,680)  
Total stockholder's equity at end of period   0 (41) (1,680)
Net unrealized gains (losses) on investments | Net unrealized gains (losses) on investments with an allowance for credit losses        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Total stockholder's equity at beginning of period (12) (7) (2)  
Other comprehensive income (loss) before reclassifications (34) (24) 0  
Amounts reclassified from accumulated other comprehensive income (loss) net of tax (33) (19) 5  
Other comprehensive income (loss) after tax (expense) benefit (1) (5) (5)  
Total stockholder's equity at end of period (13) (12) (7) (2)
Cumulative effect adjustments from changes in accounting guidance, tax     0 0
Reclassification from AOCI, tax 9 5 (1)  
Tax (expense) benefit on other comprehensive income (loss) 0 1 1  
Net unrealized gains (losses) on investments | Net unrealized gains (losses) on investments with an allowance for credit losses | Previously Reported        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Total stockholder's equity at beginning of period   (7) (2)  
Total stockholder's equity at end of period     (7) (2)
Net unrealized gains (losses) on investments | Net unrealized gains (losses) on investments with an allowance for credit losses | Revision of Prior Period, Accounting Standards Update, Adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Total stockholder's equity at beginning of period   0 0  
Total stockholder's equity at end of period     0 0
Net unrealized gains (losses) on investments | Net unrealized gains and losses on other investments        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Total stockholder's equity at beginning of period (1,613) (2,738) 3,359  
Other comprehensive income (loss) before reclassifications (310) 1,072 (6,223)  
Amounts reclassified from accumulated other comprehensive income (loss) net of tax (47) (53) (126)  
Other comprehensive income (loss) after tax (expense) benefit (263) 1,125 (6,097)  
Total stockholder's equity at end of period (1,876) (1,613) (2,738) 3,359
Cumulative effect adjustments from changes in accounting guidance, tax     0 (617)
Reclassification from AOCI, tax 13 14 21  
Tax (expense) benefit on other comprehensive income (loss) 68 (304) 1,622  
Net unrealized gains (losses) on investments | Net unrealized gains and losses on other investments | Previously Reported        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Total stockholder's equity at beginning of period   (2,738) 1,039  
Total stockholder's equity at end of period     (2,738) 1,039
Net unrealized gains (losses) on investments | Net unrealized gains and losses on other investments | Revision of Prior Period, Accounting Standards Update, Adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Total stockholder's equity at beginning of period   0 2,320  
Total stockholder's equity at end of period     0 2,320
Pension and postretirement benefits        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Total stockholder's equity at beginning of period (525) (591) (604)  
Other comprehensive income (loss) before reclassifications 17 39 (11)  
Amounts reclassified from accumulated other comprehensive income (loss) net of tax (317) (27) (24)  
Other comprehensive income (loss) after tax (expense) benefit 334 66 13  
Total stockholder's equity at end of period (191) (525) (591) (604)
Cumulative effect adjustments from changes in accounting guidance, tax     0 0
Reclassification from AOCI, tax 84 7 6  
Tax (expense) benefit on other comprehensive income (loss) (89) (17) (3)  
Pension and postretirement benefits | Previously Reported        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Total stockholder's equity at beginning of period   (591) (604)  
Total stockholder's equity at end of period     (591) (604)
Pension and postretirement benefits | Revision of Prior Period, Accounting Standards Update, Adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Total stockholder's equity at beginning of period   0 0  
Total stockholder's equity at end of period     0 0
Cumulative impact of changes in discount rates used to measure long duration contracts        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Total stockholder's equity at beginning of period (359) (41) (4,000)  
Other comprehensive income (loss) before reclassifications 712 (318) 3,959  
Amounts reclassified from accumulated other comprehensive income (loss) net of tax 0 0 0  
Other comprehensive income (loss) after tax (expense) benefit 712 (318) 3,959  
Total stockholder's equity at end of period 353 (359) (41) (4,000)
Cumulative effect adjustments from changes in accounting guidance, tax     11 1,063
Reclassification from AOCI, tax 0   0  
Tax (expense) benefit on other comprehensive income (loss) (189) 85 (1,052)  
Cumulative impact of changes in discount rates used to measure long duration contracts | Previously Reported        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Total stockholder's equity at beginning of period   0 0  
Total stockholder's equity at end of period     0 0
Cumulative impact of changes in discount rates used to measure long duration contracts | Revision of Prior Period, Accounting Standards Update, Adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Total stockholder's equity at beginning of period   (41) (4,000)  
Total stockholder's equity at end of period     (41) (4,000)
Cumulative foreign currency translation adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Total stockholder's equity at beginning of period (163) (221) (113)  
Other comprehensive income (loss) before reclassifications (101) 58 (108)  
Amounts reclassified from accumulated other comprehensive income (loss) net of tax 0 0 0  
Other comprehensive income (loss) after tax (expense) benefit (101) 58 (108)  
Total stockholder's equity at end of period (264) (163) (221) (113)
Cumulative effect adjustments from changes in accounting guidance, tax     0 0
Reclassification from AOCI, tax 0 0 0  
Tax (expense) benefit on other comprehensive income (loss) $ 0 0 0  
Cumulative foreign currency translation adjustment | Previously Reported        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Total stockholder's equity at beginning of period   (221) (113)  
Total stockholder's equity at end of period     (221) (113)
Cumulative foreign currency translation adjustment | Revision of Prior Period, Accounting Standards Update, Adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Total stockholder's equity at beginning of period   $ 0 0  
Total stockholder's equity at end of period     $ 0 $ 0