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Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss), Net Of Tax, In The Consolidated Balance Sheets) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance     $ 10,139,180  
Current period change $ (744,034) $ 122,099 (1,588,377) $ (177,721)
Balance 8,852,866 10,416,789 8,852,866 10,416,789
URA(D) On Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (571,602) 431,878 239,397 724,159
Current period change (716,523) 85,761 (1,527,521) (206,520)
Balance (1,288,124) 517,639 (1,288,124) 517,639
Foreign Currency Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (211,583) (124,972) (177,481) (115,390)
Current period change (28,269) 34,295 (62,371) 24,713
Balance (239,852) (90,677) (239,852) (90,677)
Benefit Plan Net Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (49,634) (71,827) (50,392) (73,870)
Current period change 758 2,043 1,515 4,086
Balance (48,877) (69,784) (48,877) (69,784)
Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance (832,820) 235,079 11,523 534,899
Current period change (744,034) 122,099 (1,588,377) (177,721)
Balance $ (1,576,854) $ 357,178 $ (1,576,854) $ 357,178