v3.25.2
Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period $ 18,034 $ 16,998 $ 17,937 $ 16,525
Other comprehensive income (loss) before reclassifications, after tax 163 8 353 78
Reclassification of losses from accumulated other comprehensive loss, after tax 37 16 47 47
Other comprehensive income (loss) 200 24 400 125
Amounts attributable to noncontrolling interests (17) (3) (34) (11)
Other   (3) (1) 0
Balance at end of period 18,389 17,201 18,389 17,201
Total Accumulated Other Comprehensive Income (Loss)        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period (1,685) (2,401) (1,867) (2,497)
Balance at end of period (1,502) (2,383) (1,502) (2,383)
Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) before reclassifications, tax 2 1 3 1
Reclassification of losses from accumulated other comprehensive loss, tax (2) (1) (2) (2)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period (15) (9) (13) (12)
Other comprehensive income (loss) before reclassifications, after tax (5) (4) (10) (5)
Reclassification of losses from accumulated other comprehensive loss, after tax 6 4 8 7
Other comprehensive income (loss) 1 0 (2) 2
Amounts attributable to noncontrolling interests (1)
Other   (1)
Balance at end of period (15) (10) (15) (10)
Net Unrealized Gains (Losses) on Other Investments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) before reclassifications, tax (12) 67 (85) 131
Reclassification of losses from accumulated other comprehensive loss, tax (10) (1) (11) (7)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period (1,463) (1,676) (1,720) (1,483)
Other comprehensive income (loss) before reclassifications, after tax 44 (250) 320 (489)
Reclassification of losses from accumulated other comprehensive loss, after tax 30 6 36 28
Other comprehensive income (loss) 74 (244) 356 (461)
Amounts attributable to noncontrolling interests (6) 19 (30) 38
Other   (2) (1) 3
Balance at end of period (1,395) (1,903) (1,395) (1,903)
Cumulative impact of changes in discount rates used to measure long duration contracts        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) before reclassifications, tax 0 (72) 31 (163)
Reclassification of losses from accumulated other comprehensive loss, tax 0 0 0 0
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period 219 (17) 324 (329)
Other comprehensive income (loss) before reclassifications, after tax (3) 273 (117) 614
Reclassification of losses from accumulated other comprehensive loss, after tax
Other comprehensive income (loss) (3) 273 (117) 614
Amounts attributable to noncontrolling interests 1 (22) 10 (51)
Other  
Balance at end of period 217 234 217 234
Unrealized Gains (Losses) on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) before reclassifications, tax 1 1 3 0
Reclassification of losses from accumulated other comprehensive loss, tax 0 0 0 0
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period 6 10 9 9
Other comprehensive income (loss) before reclassifications, after tax (3) (1) (6) 1
Reclassification of losses from accumulated other comprehensive loss, after tax
Other comprehensive income (loss) (3) (1) (6) 1
Amounts attributable to noncontrolling interests
Other   1
Balance at end of period 3 10 3 10
Pension and Postretirement Benefits        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) before reclassifications, tax 0 0 0 0
Reclassification of losses from accumulated other comprehensive loss, tax (1) (1) (1) (2)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period (223) (530) (224) (533)
Other comprehensive income (loss) before reclassifications, after tax (1)
Reclassification of losses from accumulated other comprehensive loss, after tax 1 6 3 12
Other comprehensive income (loss) 1 6 2 12
Amounts attributable to noncontrolling interests (1)
Other   (1) (3)
Balance at end of period (222) (525) (222) (525)
Foreign Currency Translation        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) before reclassifications, tax 0 0 0 0
Reclassification of losses from accumulated other comprehensive loss, tax 0 0 0 0
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period (209) (179) (243) (149)
Other comprehensive income (loss) before reclassifications, after tax 130 (10) 167 (43)
Reclassification of losses from accumulated other comprehensive loss, after tax
Other comprehensive income (loss) 130 (10) 167 (43)
Amounts attributable to noncontrolling interests (11) (14) 3
Other  
Balance at end of period $ (90) $ (189) $ (90) $ (189)