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Shareholders' equity AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Other comprehensive income (loss), before income tax $ 1,627 $ (990) $ 2,674 $ (1,604)        
Other Comprehensive Income (Loss), Tax 33 (29) 76 (38)        
Other Comprehensive Income (Loss), Net of Tax 1,594 (961) 2,598 (1,566)        
Total shareholders' equity 74,447 64,575 74,447 64,575   $ 68,394    
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Total shareholders' equity (2,772) (5,301) (2,772) (5,301) $ (3,704) (4,552) $ (4,825) $ (4,177)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Including Noncontrolling Interest                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Other Comprehensive Income (Loss), before Reclassifications, before Tax 918 (484) 1,761 (1,280)        
Net Realized Gains (Losses) Reclassified from AOCI (68) 5 (126) (114)        
Other comprehensive income (loss), before income tax 986 (489) 1,887 (1,166)        
Other Comprehensive Income (Loss), Tax 50 (7) 111 (49)        
Other Comprehensive Income (Loss), Net of Tax 936 (482) 1,776 (1,117)        
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Noncontrolling Interest                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Other Comprehensive Income (Loss), Net of Tax 4 (6) (4) 7        
AOCI, Liability for Future Policy Benefit, Parent                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Total shareholders' equity (746) 66 (746) 66 (645) (539) 11 51
AOCI, Liability for Future Policy Benefit, Including Noncontrolling Interest                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Other comprehensive income (loss), before income tax (130) 53 (252) 0        
Other Comprehensive Income (Loss), Tax (9) 2 (21) 22        
Other Comprehensive Income (Loss), Net of Tax (121) 51 (231) (22)        
AOCI, Liability for Future Policy Benefit, Noncontrolling Interest                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Other Comprehensive Income (Loss), Net of Tax (20) (4) (24) (37)        
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, Parent                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Total shareholders' equity (12) (13) (12) (13) (13) (16) (17) (22)
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, Including Noncontrolling Interest                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Other comprehensive income (loss), before income tax 1 5 5 10        
Other Comprehensive Income (Loss), Tax 0 1 1 1        
Other Comprehensive Income (Loss), Net of Tax 1 4 4 9        
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, Noncontrolling Interest                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Other Comprehensive Income (Loss), Net of Tax 0 0 0 0        
Cumulative Foreign Currency Translation Adjustment [Member]                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Total shareholders' equity (2,919) (3,342) (2,919) (3,342) (3,685) (4,025) (2,864) (2,945)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Other Comprehensive Income (Loss), before Reclassifications, before Tax 803 (527) 1,170 (444)        
Net Realized Gains (Losses) Reclassified from AOCI 7 3 15 6        
Other comprehensive income (loss), before income tax 796 (530) 1,155 (450)        
Other Comprehensive Income (Loss), Tax (3) (19) 9 (12)        
Other Comprehensive Income (Loss), Net of Tax 799 (511) 1,146 (438)        
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Other Comprehensive Income (Loss), Net of Tax 33 (33) 40 (41)        
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Total shareholders' equity (40) (11) (40) (11) (22) 50 13 (13)
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Other Comprehensive Income (Loss), before Reclassifications, before Tax 141 (46) 115 (54)        
Net Realized Gains (Losses) Reclassified from AOCI 164 (16) 229 (57)        
Other comprehensive income (loss), before income tax (23) (30) (114) 3        
Other Comprehensive Income (Loss), Tax (5) (6) (24) 1        
Other Comprehensive Income (Loss), Net of Tax (18) (24) (90) 2        
Accumulated Gain (Loss), Net, Cash Flow Hedge, Noncontrolling Interest                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Other Comprehensive Income (Loss), Net of Tax 0 0 0 0        
Postretirement Benefit Liability Adjustment [Member]                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Total shareholders' equity 431 297 431 297 434 438 296 297
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Other comprehensive income (loss), before income tax (3) 1 (7) (1)        
Other Comprehensive Income (Loss), Tax 0 0 0 (1)        
Other Comprehensive Income (Loss), Net of Tax (3) 1 (7) 0        
Accumulated Defined Benefit Plans Adjustment Attributable to Noncontrolling Interest                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Other Comprehensive Income (Loss), Net of Tax 0 0 0 0        
Accumulated Other Comprehensive Income (Loss) [Member]                
AOCI Attributable to Parent, Net of Tax [Roll Forward]                
Other Comprehensive Income (Loss), Net of Tax 1,577 (918) 2,586 (1,495)        
Total shareholders' equity $ (6,058) $ (8,304) $ (6,058) $ (8,304) $ (7,635) $ (8,644) $ (7,386) $ (6,809)