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Accounting Changes and Error Corrections (Future Policy Benefits) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
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 $ 38,222 $ 42,406 $ 35,689      
Life Insurance Product Line [Member] | Americas [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax (4,074) 6,120 74,207 $ 73,447    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0 0    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (103) (33)    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change 74,707 73,887 74,104 73,414    
Liability for Future Policy Benefit, Expected Net Premium, Issuance [1] 1,016 832        
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [2] 851 845        
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [3] (1,229) (1,207)        
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 0 3        
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change 70,633 80,007        
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (5,188) 7,446 85,285 84,075    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change 80,478 91,772        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     0 0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (79) 72    
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change 85,666 84,326 85,206 84,147    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [1] 1,018 833        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [2] 981 970        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [5] (1,486) (1,628)        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [4] (54) 0        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change 1 4        
Future policy benefits 9,845 11,765        
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance (417) (572)        
Liability for Future Policy Benefit, after Reinsurance 9,428 11,193        
Life Insurance Product Line [Member] | CANADA | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax (4,376) (2,933) 21,330 21,989    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0 0    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     97 166    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change 21,534 22,542 21,427 22,155    
Liability for Future Policy Benefit, Expected Net Premium, Issuance [1] 110 206        
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [2] 182 194        
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [3] (231) (248)        
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 46 235        
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change 17,158 19,609        
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (3,607) (1,621) 24,655 25,440    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change 21,289 24,421        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     0 0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     98 174    
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change 24,896 26,042 24,753 25,614    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [1] 110 206        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [2] 233 250        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [5] (256) (299)        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [4] 0 0        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change 56 271        
Future policy benefits 4,131 4,812        
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance (277) (322)        
Liability for Future Policy Benefit, after Reinsurance 3,854 4,490        
Life Insurance Product Line [Member] | EMEA [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax (2,515) (234) 14,244 14,440    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0 0    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (256) 90    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change 14,329 14,383 13,988 14,530    
Liability for Future Policy Benefit, Expected Net Premium, Issuance [1] 382 297        
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [2] 119 127        
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [3] (344) (337)        
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 184 (234)        
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change 11,814 14,149        
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (2,686) (197) 15,454 15,664    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change 12,889 15,377        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     0 0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (258) 88    
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change 15,575 15,574 15,196 15,752    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [1] 382 297        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [2] 127 135        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [5] (331) (346)        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [4] 0 0        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change 201 (264)        
Future policy benefits 1,075 1,228        
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance (37) (36)        
Liability for Future Policy Benefit, after Reinsurance 1,038 1,192        
Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax (11,029) (7,976) 40,506 37,943    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     (8) 0    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     128 (1,504)    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change 40,898 37,844 40,626 36,439    
Liability for Future Policy Benefit, Expected Net Premium, Issuance [1] 619 2,217        
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [2] 256 239        
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [3] (490) (502)        
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 (113) (549)        
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change 29,869 29,868        
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (12,914) (9,362) 44,785 41,971    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change 32,313 32,473        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     (8) 0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     121 (1,501)    
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change 45,227 41,835 44,898 40,470    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [1] 619 2,162        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [2] 293 272        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [5] (458) (506)        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [4] 0 0        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change (125) (563)        
Future policy benefits 2,444 2,605        
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance (99) (115)        
Liability for Future Policy Benefit, after Reinsurance 2,345 2,490        
Insurance, Other | Americas [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax (223) (36) 1,671 228    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0 0    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (7) (3)    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change 1,637 219 1,664 225    
Liability for Future Policy Benefit, Expected Net Premium, Issuance [1] 146 0        
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [2] 13 1        
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [3] (186) (7)        
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 1,414 183        
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (460) 107 5,823 4,628    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change 5,408 4,648        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     0 0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (11) (23)    
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change 5,868 4,541 5,812 4,605    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [1] 154 0        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [2] 56 47        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [5] (138) (111)        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [4] 0 0        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change (16) 0        
Future policy benefits 3,994 4,465        
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 0 0        
Liability for Future Policy Benefit, after Reinsurance 3,994 4,465        
Insurance, Other | CANADA | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax (336) (193) 3,394 3,329    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0 0    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (2) (7)    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change 3,344 3,882 3,392 3,322    
Liability for Future Policy Benefit, Expected Net Premium, Issuance [1] 0 581        
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [2] 27 26        
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [3] (84) (88)        
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 9 41        
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change 3,008 3,689        
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (332) (184) 3,447 3,393    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change 3,062 3,760        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     0 0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (6) (12)    
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change 3,394 3,944 3,441 3,381    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [1] 0 581        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [2] 28 27        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [5] (83) (87)        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [4] 0 0        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change 8 42        
Future policy benefits 54 71        
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 0 0        
Liability for Future Policy Benefit, after Reinsurance 54 71        
Insurance, Other | EMEA [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax (8,323) (3,365) 38,782 31,973    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0 0    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     42 111    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change 42,668 41,227 38,824 32,084    
Liability for Future Policy Benefit, Expected Net Premium, Issuance [1] 3,681 10,932        
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [2] 185 185        
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [3] (764) (799)        
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 742 (1,175)        
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change 34,345 37,862        
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (9,191) (3,472) 44,330 38,196    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change 39,070 43,738        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     0 0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     31 103    
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change 48,261 47,210 44,361 38,299    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [1] 3,681 10,932        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [2] 225 228        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [5] (858) (895)        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [4] 0 0        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change 852 (1,354)        
Future policy benefits 4,725 5,876        
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 0 0        
Liability for Future Policy Benefit, after Reinsurance 4,725 5,876        
Insurance, Other | Asia Pacific [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax 74 187 1,605 1,051    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0 0    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     0 47    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change 1,574 1,739 1,605 1,098    
Liability for Future Policy Benefit, Expected Net Premium, Issuance [1] 1,244 1,325        
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [2] 6 6        
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [3] (1,260) (613)        
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 (21) (77)        
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change 1,648 1,926        
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (250) 51 6,561 6,062    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change 7,472 7,107        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     0 0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (1) 48    
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change 7,722 7,056 6,560 6,110    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [1] 1,289 1,325        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [2] 18 17        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [5] (68) (50)        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [4] 0 0        
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change (77) (346)        
Future policy benefits 5,824 5,181        
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 0 0        
Liability for Future Policy Benefit, after Reinsurance $ 5,824 $ 5,181        
Accounting Standards Update 2018-12            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Future policy benefits     35,689 47,449    
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Americas [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax     (6,303) 15,771    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change       (805)   $ 984
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience       (4)   254
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change       72,638   71,555
Liability for Future Policy Benefit, Expected Net Premium, Issuance [6]     3,329 3,522    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [7]     3,423 3,400    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [8]     (5,182) (5,025)    
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [9]     0 0    
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change     (1) (5)    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change     67,904 89,218    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance     85,285 84,075   81,172
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax     (7,907) 19,185    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change     77,378 103,260    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change       (675)   1,021
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience       85   517
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change       83,485   82,710
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [6]     3,333 3,537    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [7]     3,940 3,916    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [10]     (5,472) (6,083)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [9]     0 0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change     (1) (5)    
Future policy benefits     9,474 14,042 $ 17,632  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance     (421) (697) (1,123)  
Liability for Future Policy Benefit, after Reinsurance     9,053 13,345 16,509  
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance     74,207 73,447   70,317
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | CANADA | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax     (4,899) (199)    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change       189   (45)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience       212   (24)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change       22,390   21,230
Liability for Future Policy Benefit, Expected Net Premium, Issuance [6]     635 761    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [7]     748 775    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [8]     (950) (947)    
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [9]     0 0    
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change     (1,493) 170    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change     16,431 21,790    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance     24,655 25,440   24,587
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax     (4,273) 1,905    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change     20,382 27,345    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change       191   (45)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience       212   (24)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change       25,843   24,518
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [6]     635 761    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [7]     958 992    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [10]     (1,051) (1,025)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [9]     0 0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change     (1,730) 194    
Future policy benefits     3,951 5,555 6,364  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance     (265) (367) (386)  
Liability for Future Policy Benefit, after Reinsurance     3,686 5,188 5,978  
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance     21,330 21,989   21,299
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | EMEA [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax     (2,639) 1,280    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change       123   48
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience       835   379
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change       15,398   14,426
Liability for Future Policy Benefit, Expected Net Premium, Issuance [6]     1,083 2,417    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [7]     500 553    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [8]     (1,324) (1,488)    
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [9]     0 (1,167)    
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change     (1,413) (301)    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change     11,605 15,720    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance     15,454 15,664   15,281
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax     (2,808) 1,445    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change     12,646 17,109    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change       136   42
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience       813   422
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change       16,613   15,745
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [6]     1,083 2,436    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [7]     530 598    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [10]     (1,260) (1,609)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [9]     0 (1,176)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change     (1,512) (330)    
Future policy benefits     1,041 1,389 2,670  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance     (31) (34) (85)  
Liability for Future Policy Benefit, after Reinsurance     1,010 1,355 2,585  
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance     14,244 14,440   13,999
Accounting Standards Update 2018-12 | Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax     (10,927) (5,458)    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change       1,604   600
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience       197   402
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change       39,744   35,135
Liability for Future Policy Benefit, Expected Net Premium, Issuance [6]     3,663 4,575    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [7]     1,032 970    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [8]     (1,989) (2,038)    
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [9]     0 0    
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change     (1,944) (699)    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change     29,579 32,485    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance     44,785 41,971   37,765
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax     (12,858) (6,475)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change     31,927 35,496    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change       1,681   699
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience       234   559
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change       43,886   39,023
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [6]     3,667 4,585    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [7]     1,171 1,107    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [10]     (1,832) (1,971)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [9]     0 0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change     (2,107) (773)    
Future policy benefits     2,348 3,011 4,419  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance     (100) (116) (212)  
Liability for Future Policy Benefit, after Reinsurance     2,248 2,895 4,207  
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance     40,506 37,943   34,133
Accounting Standards Update 2018-12 | Insurance, Other | Americas [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax     (284) 28    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change       (31)   (33)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience       (22)   (29)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change       175   252
Liability for Future Policy Benefit, Expected Net Premium, Issuance [6]     1,580 0    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [7]     41 3    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [8]     (125) (27)    
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [9]     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     1,387 256    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance     5,823 4,628   4,951
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax     (617) 575    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change     5,206 5,203    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change       (34)   (33)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience       (46)   (37)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change       4,548   4,881
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [6]     1,580 0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [7]     220 193    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [10]     (525) (446)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [9]     0 0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change     0 0    
Future policy benefits     3,819 4,947 5,883  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance     0 0 0  
Liability for Future Policy Benefit, after Reinsurance     3,819 4,947 5,883  
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance     1,671 228   314
Accounting Standards Update 2018-12 | Insurance, Other | CANADA | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax     (433) 97    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change       0   (30)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience       (12)   17
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change       3,317   3,543
Liability for Future Policy Benefit, Expected Net Premium, Issuance [6]     574 0    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [7]     112 109    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [8]     (354) (349)    
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [9]     0 0    
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change     (255) 26    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change     2,961 3,426    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance     3,447 3,393   3,592
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax     (432) 114    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change     3,015 3,507    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change       0   6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience       (24)   6
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change       3,369   3,604
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [6]     574 0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [7]     115 112    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [10]     (351) (350)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [9]     0 0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change     (260) 27    
Future policy benefits     54 81 49  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance     0 0 0  
Liability for Future Policy Benefit, after Reinsurance     54 81 49  
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance     3,394 3,329   3,556
Accounting Standards Update 2018-12 | Insurance, Other | EMEA [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax     (8,805) 668    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change       (126)   (76)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience       573   997
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change       32,420   28,720
Liability for Future Policy Benefit, Expected Net Premium, Issuance [6]     12,594 8,357    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [7]     698 714    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [8]     (3,169) (3,590)    
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [9]     0 (1,669)    
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change     (3,761) (559)    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change     29,977 32,641    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance     44,330 38,196   33,410
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax     (9,719) 1,174    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change     34,611 39,370    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change       (140)   (76)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience       566   1,000
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change       38,622   34,334
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [6]     12,594 8,357    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [7]     856 890    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [10]     (3,355) (3,064)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [9]     0 (1,682)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change     (4,387) (639)    
Future policy benefits     4,634 6,729 6,991  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance     0 0 0  
Liability for Future Policy Benefit, after Reinsurance     4,634 6,729 6,991  
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance     38,782 31,973   27,799
Accounting Standards Update 2018-12 | Insurance, Other | Asia Pacific [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax     25 247    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change       3   0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience       29   777
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change       1,083   1,558
Liability for Future Policy Benefit, Expected Net Premium, Issuance [6]     1,465 3,156    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income [7]     24 28    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected [8]     (764) (3,621)    
Liability for Future Policy Benefit, Expected Net Premium, Derecognition [9]     0 0    
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change     (203) (70)    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change     1,630 1,298    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance     6,561 6,062   2,653
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax     (435) 250    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change     6,126 6,312    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change       3   0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience       36   777
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change       6,101   3,430
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [6]     1,465 3,156    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense [7]     70 63    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment [10]     (227) (162)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition [9]     0 0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change     (848) (425)    
Future policy benefits     4,496 5,014 1,887  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance     0 0 0  
Liability for Future Policy Benefit, after Reinsurance     4,496 5,014 1,887  
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance     1,605 1,051   781
Accounting Standards Update 2018-12 | Previously Reported            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Future policy benefits     $ 35,220 $ 35,782    
Accounting Standards Update 2018-12 | Previously Reported | Life Insurance Product Line [Member] | Americas [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Future policy benefits         10,444  
Accounting Standards Update 2018-12 | Previously Reported | Life Insurance Product Line [Member] | CANADA | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Future policy benefits         3,477  
Accounting Standards Update 2018-12 | Previously Reported | Life Insurance Product Line [Member] | EMEA [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Future policy benefits         1,379  
Accounting Standards Update 2018-12 | Previously Reported | Life Insurance Product Line [Member] | Asia Pacific [Member] | Other Segments            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Future policy benefits         3,568  
Accounting Standards Update 2018-12 | Previously Reported | Insurance, Other | Americas [Member] | 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
Future policy benefits         5,037  
Accounting Standards Update 2018-12 | Previously Reported | Insurance, Other | CANADA | 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
Future policy benefits         16  
Accounting Standards Update 2018-12 | Previously Reported | Insurance, Other | EMEA [Member] | 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
Future policy benefits         5,657  
Accounting Standards Update 2018-12 | Previously Reported | Insurance, Other | Asia Pacific [Member] | 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
Future policy benefits         $ 1,874  
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Life Insurance Product Line [Member] | Americas [Member] | 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
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Life Insurance Product Line [Member] | CANADA | 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
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Life Insurance Product Line [Member] | EMEA [Member] | 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
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Life Insurance Product Line [Member] | Asia Pacific [Member] | 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)
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Insurance, Other | Americas [Member] | 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
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Insurance, Other | CANADA | 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
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Insurance, Other | EMEA [Member] | 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
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Insurance, Other | Asia Pacific [Member] | 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
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Life Insurance Product Line [Member] | Americas [Member] | 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
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Life Insurance Product Line [Member] | CANADA | 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
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Life Insurance Product Line [Member] | EMEA [Member] | 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
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Life Insurance Product Line [Member] | Asia Pacific [Member] | 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
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Insurance, Other | Americas [Member] | 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
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Insurance, Other | CANADA | 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
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Insurance, Other | EMEA [Member] | 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
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjusted Balance | Insurance, Other | Asia Pacific [Member] | 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
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Original Balance | Life Insurance Product Line [Member] | Americas [Member] | 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
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Original Balance | Life Insurance Product Line [Member] | CANADA | 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
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Original Balance | Life Insurance Product Line [Member] | EMEA [Member] | 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
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Original Balance | Life Insurance Product Line [Member] | Asia Pacific [Member] | 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
[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 current assumptions.