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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 ($) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Balance, beginning of period |  | $ 7,903,804,000 |  |  | $ 7,903,804,000 |  |  |  |
Current period change | $ 171,209,000 |  | $ (103,364,000) |  | 417,655,000 | $ (283,246,000) |  |  |
Change to beginning balance due to adoption of Accounting Standards Update 2016-01 |  |  |  |  |  |  | $ 0 |  | $ 1,201,000
Balance, end of period | 8,884,160,000 |  | 8,241,349,000 |  | 8,884,160,000 | 8,241,349,000 |  |  |
URA(D) On Securities [Member] |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Balance, beginning of period | 51,851,000 | (179,392,000) | (150,628,000) | $ 49,969,000 | (179,392,000) | 49,969,000 |  |  |
Current period change | 197,312,000 |  | (41,928,000) |  | 428,729,000 | (241,114,000) |  |  |
Change to beginning balance due to adoption of Accounting Standards Update 2016-01 |  | 0 |  | 0 |  |  |  | $ 0 | (1,201,000)
Balance, end of period | 247,741,000 | 51,851,000 | (192,155,000) | (150,628,000) | 247,741,000 | (192,155,000) |  |  |
URA(D) On Securities OTTI [Member] |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Current period change | (1,422,000) |  | 401,000 |  | (1,596,000) | 191,000 |  |  |
Foreign Currency Translation Adjustment [Member] |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Balance, beginning of period | (201,695,000) | (215,747,000) | (121,232,000) | (138,931,000) | (215,747,000) | (138,931,000) |  |  |
Current period change | (25,832,000) |  | (63,652,000) |  | (11,780,000) | (45,953,000) |  |  |
Balance, end of period | (227,527,000) | (201,695,000) | (184,884,000) | (121,232,000) | (227,527,000) | (184,884,000) |  |  |
Benefit Plan Net Actuarial Gain (Loss) [Member] |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Balance, beginning of period | (66,267,000) | (67,418,000) | (70,114,000) | (71,929,000) | (67,418,000) | (71,929,000) |  |  |
Current period change | 1,151,000 |  | 1,815,000 |  | 2,302,000 | 3,630,000 |  |  |
Balance, end of period | (65,116,000) | (66,267,000) | (68,299,000) | (70,114,000) | (65,116,000) | (68,299,000) |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member] |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |
Balance, beginning of period | (216,111,000) |  | (341,974,000) | (160,891,000) |  | (160,891,000) |  |  |
Current period change | 171,209,000 | 246,446,000 | (103,364,000) | (179,882,000) |  |  |  |  |
Change to beginning balance due to adoption of Accounting Standards Update 2016-01 |  |  |  |  |  |  |  | $ 0 | $ (1,201,000)
Balance, end of period | $ (44,902,000) | $ (216,111,000) | $ (445,338,000) | $ (341,974,000) | $ (44,902,000) | $ (445,338,000) |  |  |

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