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Segment Information (Total Revenues of Reportable Segments) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues $ 3,195,908 $ 3,129,276 $ 6,369,615 $ 6,138,016
Americas [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues 1,794,095 1,794,674 3,497,141 3,582,023
CANADA        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues 324,288 281,276 639,384 557,358
EMEA [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues 473,213 419,325 955,138 817,400
Asia Pacific [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues 588,512 579,513 1,222,897 1,105,195
Corporate and Other [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues 15,800 54,488 55,055 76,040
Life Insurance Product Line [Member] | Americas [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues 1,564,147 1,522,698 3,053,841 3,011,201
Life Insurance Product Line [Member] | CANADA        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues 312,199 269,273 614,518 533,548
Life Insurance Product Line [Member] | EMEA [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues 372,538 345,920 766,320 664,006
Life Insurance Product Line [Member] | Asia Pacific [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues 570,520 561,529 1,185,059 1,066,759
Nontraditional Long-Duration Contracts [Member] | Americas [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues 229,948 271,976 443,300 570,822
Nontraditional Long-Duration Contracts [Member] | CANADA        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues 12,089 12,003 24,866 23,810
Nontraditional Long-Duration Contracts [Member] | EMEA [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues 100,675 73,405 188,818 153,394
Nontraditional Long-Duration Contracts [Member] | Asia Pacific [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues $ 17,992 $ 17,984 $ 37,838 $ 38,436