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Segment Information (Total Revenues of Reportable Segments) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues $ 4,119 $ 3,204
Other Segments | Americas [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 1,955 1,672
Other Segments | CANADA    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 369 320
Other Segments | EMEA [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 603 485
Other Segments | Asia Pacific [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 751 735
Corporate and Other [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 441 (8)
Life Insurance Product Line [Member] | Other Segments | Americas [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 1,637 1,533
Life Insurance Product Line [Member] | Other Segments | CANADA    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 343 296
Life Insurance Product Line [Member] | Other Segments | EMEA [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 457 407
Life Insurance Product Line [Member] | Other Segments | Asia Pacific [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 647 667
Nontraditional Long-Duration Contracts [Member] | Other Segments | Americas [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 318 139
Nontraditional Long-Duration Contracts [Member] | Other Segments | CANADA    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 26 24
Nontraditional Long-Duration Contracts [Member] | Other Segments | EMEA [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues 146 78
Nontraditional Long-Duration Contracts [Member] | Other Segments | Asia Pacific [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenues $ 104 $ 68