v3.25.1
Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period $ 17,937 $ 16,525
Other comprehensive income (loss) before reclassifications, after tax 190 70
Reclassification of losses from accumulated other comprehensive loss, after tax 10 31
Other comprehensive income (loss) 200 101
Amounts attributable to noncontrolling interests (17) (8)
Other (1) 3
Balance at end of period 18,034 16,998
Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period (13) (12)
Other comprehensive income (loss) before reclassifications, after tax (5) (1)
Reclassification of losses from accumulated other comprehensive loss, after tax 2 3
Other comprehensive income (loss) (3) 2
Amounts attributable to noncontrolling interests 1
Other 1
Balance at end of period (15) (9)
Other comprehensive income (loss) before reclassifications, tax 1 0
Reclassification of losses from accumulated other comprehensive loss, tax 0 (1)
Net Unrealized Gains (Losses) on Other Investments    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period (1,720) (1,483)
Other comprehensive income (loss) before reclassifications, after tax 276 (239)
Reclassification of losses from accumulated other comprehensive loss, after tax 6 22
Other comprehensive income (loss) 282 (217)
Amounts attributable to noncontrolling interests (24) 19
Other (1) 5
Balance at end of period (1,463) (1,676)
Other comprehensive income (loss) before reclassifications, tax (73) 64
Reclassification of losses from accumulated other comprehensive loss, tax (1) (6)
Cumulative impact of changes in discount rates used to measure long duration contracts    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period 324 (329)
Other comprehensive income (loss) before reclassifications, after tax (114) 341
Reclassification of losses from accumulated other comprehensive loss, after tax
Other comprehensive income (loss) (114) 341
Amounts attributable to noncontrolling interests 9 (29)
Other
Balance at end of period 219 (17)
Other comprehensive income (loss) before reclassifications, tax 31 (91)
Reclassification of losses from accumulated other comprehensive loss, tax 0 0
Unrealized Gains (Losses) on Cash Flow Hedges    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period 9 9
Other comprehensive income (loss) before reclassifications, after tax (3) 2
Reclassification of losses from accumulated other comprehensive loss, after tax
Other comprehensive income (loss) (3) 2
Amounts attributable to noncontrolling interests
Other (1)
Balance at end of period 6 10
Other comprehensive income (loss) before reclassifications, tax 2 (1)
Reclassification of losses from accumulated other comprehensive loss, tax 0 0
Pension and Postretirement Benefits    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period (224) (533)
Other comprehensive income (loss) before reclassifications, after tax (1)
Reclassification of losses from accumulated other comprehensive loss, after tax 2 6
Other comprehensive income (loss) 1 6
Amounts attributable to noncontrolling interests (1)
Other (2)
Balance at end of period (223) (530)
Other comprehensive income (loss) before reclassifications, tax 0 0
Reclassification of losses from accumulated other comprehensive loss, tax 0 (1)
Foreign Currency Translation    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period (243) (149)
Other comprehensive income (loss) before reclassifications, after tax 37 (33)
Reclassification of losses from accumulated other comprehensive loss, after tax
Other comprehensive income (loss) 37 (33)
Amounts attributable to noncontrolling interests (3) 3
Other
Balance at end of period (209) (179)
Other comprehensive income (loss) before reclassifications, tax 0 0
Reclassification of losses from accumulated other comprehensive loss, tax 0 0
Total Accumulated Other Comprehensive Income (Loss)    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period (1,867) (2,497)
Balance at end of period $ (1,685) $ (2,401)