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Impact of New Accounting Standard (Future Policy Benefits) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Future policy benefits   $ 41,231 $ 35,689      
Accounting Standards Update 2018-12            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Future policy benefits     35,689 $ 47,449    
Life Insurance Product Line [Member] | Americas [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change     75,200 72,638    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance   76,943 74,207 73,447    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     905 (805)    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     88 (4)    
Liability for Future Policy Benefit, Expected Net Premium, Issuance [1]   4,174 3,329      
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [2]   3,526 3,423      
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [3]   (5,928) (5,182)      
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [4]   (35) 0      
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change   6 (1)      
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change   72,370 67,904      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     170 85    
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     86,377 83,485    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [4]   (54) 0      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance   89,036 85,285 84,075    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     922 (675)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [1]   4,174 3,333      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [2]   4,075 3,940      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [5]   (5,545) (5,472)      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change   9 (1)      
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change   83,317 77,378      
Future policy benefits   10,947 9,474      
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance   (767) (421)      
Liability for Future Policy Benefit, after Reinsurance   10,180 9,053      
Life Insurance Product Line [Member] | Americas [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax       15,771    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change           $ 71,555
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance       73,447   70,317
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change           984
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience           254
Liability for Future Policy Benefit, Expected Net Premium, Issuance     3,522 [6]    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [7]       3,400    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [8]       (5,025)    
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [9]       0    
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change       (5)    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change       89,218    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience           517
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change           82,710
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax       19,185    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [9]       0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance       84,075   81,172
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change           1,021
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [6]       3,537    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [7]       3,916    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [10]       (6,083)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change       (5)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change       103,260    
Future policy benefits       14,042 $ 17,632  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance       (697) (1,123)  
Liability for Future Policy Benefit, after Reinsurance       13,345 16,509  
Life Insurance Product Line [Member] | Canada Segment Reporting Information [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change     21,827 22,390    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance   22,689 21,330 21,989    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     96 189    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     401 212    
Liability for Future Policy Benefit, Expected Net Premium, Issuance [1]   546 635      
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [2]   753 748      
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [3]   (941) (950)      
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [4]   0 0      
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change   504 (1,493)      
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change   18,509 16,431      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     410 212    
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     25,173 25,843    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [4]   0 0      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance   26,275 24,655 25,440    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     108 191    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [1]   546 635      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [2]   965 958      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [5]   (995) (1,051)      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change   586 (1,730)      
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change   22,966 20,382      
Future policy benefits   4,457 3,951      
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance   (298) (265)      
Liability for Future Policy Benefit, after Reinsurance   4,159 3,686      
Life Insurance Product Line [Member] | Canada Segment Reporting Information [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax       (199)    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change           21,230
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance       21,989   21,299
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change           (45)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience           (24)
Liability for Future Policy Benefit, Expected Net Premium, Issuance     761 [6]    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [7]       775    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [8]       (947)    
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [9]       0    
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change       170    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change       21,790    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience           (24)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change           24,518
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax       1,905    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [9]       0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance       25,440   24,587
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change           (45)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [6]       761    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [7]       992    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [10]       (1,025)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change       194    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change       27,345    
Future policy benefits       5,555 6,364  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance       (367) (386)  
Liability for Future Policy Benefit, after Reinsurance       5,188 5,978  
Life Insurance Product Line [Member] | EMEA [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change     14,697 15,398    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance   15,328 14,244 14,440    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     199 123    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     254 835    
Liability for Future Policy Benefit, Expected Net Premium, Issuance [1]   1,074 1,083      
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [2]   509 500      
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [3]   (1,492) (1,324)      
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [4]   0 0      
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change   540 (1,413)      
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change   13,042 11,605      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     267 813    
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     15,967 16,613    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [4]   0 0      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance   16,756 15,454 15,664    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     246 136    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [1]   1,076 1,083      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [2]   549 530      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [5]   (1,427) (1,260)      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change   591 (1,512)      
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change   14,251 12,646      
Future policy benefits   1,209 1,041      
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance   (34) (31)      
Liability for Future Policy Benefit, after Reinsurance   1,175 1,010      
Life Insurance Product Line [Member] | EMEA [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax       1,280    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change           14,426
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance       14,440   13,999
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change           48
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience           379
Liability for Future Policy Benefit, Expected Net Premium, Issuance     2,417 [6]    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [7]       553    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [8]       (1,488)    
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [9]       (1,167)    
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change       (301)    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change       15,720    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience           422
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change           15,745
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax       1,445    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [9]       (1,176)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance       15,664   15,281
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change           42
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [6]       2,436    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [7]       598    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [10]       (1,609)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change       (330)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change       17,109    
Future policy benefits       1,389 2,670  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance       (34) (85)  
Liability for Future Policy Benefit, after Reinsurance       1,355 2,585  
Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change     40,560 39,744    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance   42,741 40,506 37,943    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     (180) 1,604    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     234 197    
Liability for Future Policy Benefit, Expected Net Premium, Issuance [1]   3,469 3,663      
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [2]   1,072 1,032      
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [3]   (2,042) (1,989)      
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [4]   0 0      
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change   (318) (1,944)      
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change   30,742 29,579      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     189 234    
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     44,803 43,886    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [4]   0 0      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance   47,370 44,785 41,971    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     (171) 1,681    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [1]   3,470 3,667      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [2]   1,225 1,171      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [5]   (1,846) (1,832)      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change   (282) (2,107)      
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change   33,406 31,927      
Future policy benefits   2,664 2,348      
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance   (122) (100)      
Liability for Future Policy Benefit, after Reinsurance   2,542 2,248      
Life Insurance Product Line [Member] | Asia Pacific [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax       (5,458)    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change           35,135
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance       37,943   34,133
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change           600
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience           402
Liability for Future Policy Benefit, Expected Net Premium, Issuance     4,575 [6]    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [7]       970    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [8]       (2,038)    
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [9]       0    
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change       (699)    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change       32,485    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience           559
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change           39,023
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax       (6,475)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [9]       0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance       41,971   37,765
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change           699
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [6]       4,585    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [7]       1,107    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [10]       (1,971)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change       (773)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change       35,496    
Future policy benefits       3,011 4,419  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance       (116) (212)  
Liability for Future Policy Benefit, after Reinsurance       2,895 4,207  
Insurance, Other [Member] | Americas [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change     1,581 175    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance   1,455 1,671 228    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     (69) (31)    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (21) (22)    
Liability for Future Policy Benefit, Expected Net Premium, Issuance [1]   1,423 1,580      
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [2]   49 41      
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [3]   (1,598) (125)      
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [4]   0 0      
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change   0 0      
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change   1,246 1,387      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (29) (46)    
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     5,703 4,548    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [4]   (16) 0      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance   6,843 5,823 4,628    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     (91) (34)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [1]   1,467 1,580      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [2]   239 220      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [5]   (550) (525)      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change   0 0      
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change   6,474 5,206      
Future policy benefits   5,228 3,819      
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance   (913) 0      
Liability for Future Policy Benefit, after Reinsurance   4,315 3,819      
Insurance, Other [Member] | Americas [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax       28    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change           252
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance       228   314
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change           (33)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience           (29)
Liability for Future Policy Benefit, Expected Net Premium, Issuance [6]       0    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [7]       3    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [8]       (27)    
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [9]       0    
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change       0    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change       256    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience           (37)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change           4,881
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax       575    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [9]       0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance       4,628   4,951
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change           (33)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [6]       0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [7]       193    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [10]       (446)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change       0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change       5,203    
Future policy benefits       4,947 5,883  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance       0 0  
Liability for Future Policy Benefit, after Reinsurance       4,947 5,883  
Insurance, Other [Member] | Canada Segment Reporting Information [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change     3,335 3,317    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance   3,184 3,394 3,329    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     (54) 0    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (5) (12)    
Liability for Future Policy Benefit, Expected Net Premium, Issuance [1]   0 574      
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [2]   105 112      
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [3]   (329) (354)      
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [4]   0 0      
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change   73 (255)      
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change   2,888 2,961      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (13) (24)    
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     3,358 3,369    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [4]   0 0      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance   3,210 3,447 3,393    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     (76) 0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [1]   0 574      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [2]   107 115      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [5]   (328) (351)      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change   73 (260)      
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change   2,917 3,015      
Future policy benefits   29 54      
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance   0 0      
Liability for Future Policy Benefit, after Reinsurance   29 54      
Insurance, Other [Member] | Canada Segment Reporting Information [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax       97    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change           3,543
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance       3,329   3,556
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change           (30)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience           17
Liability for Future Policy Benefit, Expected Net Premium, Issuance [6]       0    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [7]       109    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [8]       (349)    
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [9]       0    
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change       26    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change       3,426    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience           6
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change           3,604
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax       114    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [9]       0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance       3,393   3,592
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change           6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [6]       0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [7]       112    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [10]       (350)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change       27    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change       3,507    
Future policy benefits       81 49  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance       0 0  
Liability for Future Policy Benefit, after Reinsurance       81 49  
Insurance, Other [Member] | EMEA [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change     43,267 32,420    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance   54,832 38,782 31,973    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     (561) (126)    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     5,046 573    
Liability for Future Policy Benefit, Expected Net Premium, Issuance [1]   12,489 12,594      
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [2]   1,028 698      
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [3]   (3,991) (3,169)      
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [4]   0 0      
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change   2,039 (3,761)      
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change   48,266 29,977      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     4,991 566    
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     48,726 38,622    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [4]   0 0      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance   60,938 44,330 38,196    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     (595) (140)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [1]   12,489 12,594      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [2]   1,206 856      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [5]   (3,803) (3,355)      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change   2,320 (4,387)      
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change   53,719 34,611      
Future policy benefits   5,453 4,634      
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance   0 0      
Liability for Future Policy Benefit, after Reinsurance   5,453 4,634      
Insurance, Other [Member] | EMEA [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax       668    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change           28,720
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance       31,973   27,799
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change           (76)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience           997
Liability for Future Policy Benefit, Expected Net Premium, Issuance [6]       8,357    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [7]       714    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [8]       (3,590)    
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [9]       (1,669)    
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change       (559)    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change       32,641    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience           1,000
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change           34,334
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax       1,174    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [9]       (1,682)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance       38,196   33,410
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change           (76)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [6]       8,357    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [7]       890    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [10]       (3,064)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change       (639)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change       39,370    
Future policy benefits       6,729 6,991  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance       0 0  
Liability for Future Policy Benefit, after Reinsurance       6,729 6,991  
Insurance, Other [Member] | Asia Pacific [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change     1,590 1,083    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance   2,057 1,605 1,051    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0 3    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (15) 29    
Liability for Future Policy Benefit, Expected Net Premium, Issuance [1]   2,160 1,465      
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [2]   26 24      
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [3]   (1,601) (764)      
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [4]   0 0      
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change   (118) (203)      
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change   1,900 1,630      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (17) 36    
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     6,544 6,101    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [4]   0 0      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance   8,019 6,561 6,062    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     0 3    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [1]   2,170 1,465      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [2]   89 70      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [5]   (271) (227)      
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change   (513) (848)      
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change   7,090 6,126      
Future policy benefits   5,190 4,496      
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance   0 0      
Liability for Future Policy Benefit, after Reinsurance   $ 5,190 $ 4,496      
Insurance, Other [Member] | Asia Pacific [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax       247    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change           1,558
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance       1,051   781
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change           0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience           777
Liability for Future Policy Benefit, Expected Net Premium, Issuance [6]       3,156    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [7]       28    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [8]       (3,621)    
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [9]       0    
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change       (70)    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change       1,298    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience           777
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change           3,430
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax       250    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [9]       0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance       6,062   2,653
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change           0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [6]       3,156    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [7]       63    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [10]       (162)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change       (425)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change       6,312    
Future policy benefits       5,014 1,887  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance       0 0  
Liability for Future Policy Benefit, after Reinsurance       $ 5,014 $ 1,887  
Cumulative Effect, Period of Adoption, Original Balance | Life Insurance Product Line [Member] | Americas [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           70,319
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           80,275
Cumulative Effect, Period of Adoption, Original Balance | Life Insurance Product Line [Member] | Canada Segment Reporting Information [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           21,332
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           24,587
Cumulative Effect, Period of Adoption, Original Balance | Life Insurance Product Line [Member] | EMEA [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           14,033
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           15,246
Cumulative Effect, Period of Adoption, Original Balance | Life Insurance Product Line [Member] | Asia Pacific [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           34,167
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           37,335
Cumulative Effect, Period of Adoption, Original Balance | Insurance, Other [Member] | Americas [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           285
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           4,951
Cumulative Effect, Period of Adoption, Original Balance | Insurance, Other [Member] | Canada Segment Reporting Information [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           3,568
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           3,584
Cumulative Effect, Period of Adoption, Original Balance | Insurance, Other [Member] | EMEA [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           28,055
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           33,410
Cumulative Effect, Period of Adoption, Original Balance | Insurance, Other [Member] | Asia Pacific [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           781
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           2,645
Cumulative Effect, Period of Adoption, Adjustment | Life Insurance Product Line [Member] | Americas [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           20,758
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           26,196
Cumulative Effect, Period of Adoption, Adjustment | Life Insurance Product Line [Member] | Canada Segment Reporting Information [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           1,785
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           4,469
Cumulative Effect, Period of Adoption, Adjustment | Life Insurance Product Line [Member] | EMEA [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           2,599
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           2,989
Cumulative Effect, Period of Adoption, Adjustment | Life Insurance Product Line [Member] | Asia Pacific [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           (3,385)
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           (3,694)
Cumulative Effect, Period of Adoption, Adjustment | Insurance, Other [Member] | Americas [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           102
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           931
Cumulative Effect, Period of Adoption, Adjustment | Insurance, Other [Member] | Canada Segment Reporting Information [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           343
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           372
Cumulative Effect, Period of Adoption, Adjustment | Insurance, Other [Member] | EMEA [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           3,634
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           4,901
Cumulative Effect, Period of Adoption, Adjustment | Insurance, Other [Member] | Asia Pacific [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           114
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           125
Cumulative Effect, Period of Adoption, Adjusted Balance | Life Insurance Product Line [Member] | Americas [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           91,077
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           106,471
Cumulative Effect, Period of Adoption, Adjusted Balance | Life Insurance Product Line [Member] | Canada Segment Reporting Information [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           23,117
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           29,056
Cumulative Effect, Period of Adoption, Adjusted Balance | Life Insurance Product Line [Member] | EMEA [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           16,632
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           18,235
Cumulative Effect, Period of Adoption, Adjusted Balance | Life Insurance Product Line [Member] | Asia Pacific [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           30,782
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           33,641
Cumulative Effect, Period of Adoption, Adjusted Balance | Insurance, Other [Member] | Americas [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           387
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           5,882
Cumulative Effect, Period of Adoption, Adjusted Balance | Insurance, Other [Member] | Canada Segment Reporting Information [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           3,911
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           3,956
Cumulative Effect, Period of Adoption, Adjusted Balance | Insurance, Other [Member] | EMEA [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           31,689
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           38,311
Cumulative Effect, Period of Adoption, Adjusted Balance | Insurance, Other [Member] | Asia Pacific [Member] | Accounting Standards Update 2018-12 | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax           895
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax           $ 2,770
[1] Issuances: The present value, using the original discount rate, of the expected net premiums or the expected future policy benefits related to new reinsurance contracts that became effective during the current period and new policies assumed on existing contracts.
[2] Interest accrual: The interest earned on the beginning present value of either the expected net premiums or the expected future policy benefits using the original interest rate.
[3] Net premiums collected: The portion of gross premiums collected from the ceding company that is used to fund expected benefit payments.
[4] Derecognition: Includes the effects of treaty recaptures and treaty amendments that resulted in the termination of an existing treaty and the issuance of a new treaty under the internal replacement model.
[5] Benefit payments: The release of the present value, using the original discount rate, of the expected future policy benefits due to death, lapse/withdrawal, and other benefit payments based on current assumptions.
[6] Issuances: The present value, using the original discount rate, of the expected net premiums or the expected future policy benefits related to new reinsurance contracts that became effective during the current period and new policies assumed on existing contracts.
[7] Interest accrual: The interest earned on the beginning present value of either the expected net premiums or the expected future policy benefits using the original interest rate.
[8] Net premiums collected: The portion of gross premiums collected from the ceding company that is used to fund expected benefit payments.
[9] Derecognition: Includes the effects of treaty recaptures and treaty amendments that resulted in the termination of an existing treaty and the issuance of a new treaty under the internal replacement model.
[10] Benefit payments: The release of the present value, using the original discount rate, of the expected future policy benefits due to death, lapse/withdrawal, and other benefit payments based on the revised assumptions.