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Segment Information (Reconciliation of Assets from Segment to Consolidated) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets $ 64,535,245 $ 60,514,818
Americas [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 39,106,169 34,562,629
Canada Segment Reporting Information [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 4,354,792 4,287,824
EMEA [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 8,380,703 8,374,488
Asia Pacific [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 6,861,723 6,114,027
Corporate and Other [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 5,831,858 7,175,850
Life Insurance Product Line [Member] | Americas [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 19,235,781 18,603,423
Life Insurance Product Line [Member] | Canada Segment Reporting Information [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 4,200,792 4,161,452
Life Insurance Product Line [Member] | EMEA [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 3,643,174 3,099,495
Life Insurance Product Line [Member] | Asia Pacific [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 5,680,978 4,915,442
Other Insurance Product Line [Member] | Americas [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 19,870,388 15,959,206
Other Insurance Product Line [Member] | Canada Segment Reporting Information [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 154,000 126,372
Other Insurance Product Line [Member] | EMEA [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 4,737,529 5,274,993
Other Insurance Product Line [Member] | Asia Pacific [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets $ 1,180,745 $ 1,198,585