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Investments (Credit Quality Indicators) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]    
Recording investment gross of allowance for credit losses $ 59,765 $ 56,948
Commercial Mortgage Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 5,733 3,835
One Years Prior 3,712 6,402
Two Years Prior 6,286 3,361
Three Years Prior 3,275 6,779
Four Years Prior 6,573 7,098
Prior 26,180 22,002
Revolving Loans 0 0
Recording investment gross of allowance for credit losses 51,759 49,477
Commercial Mortgage Loans | ≥ 1.2X    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 5,237 3,249
One Years Prior 3,194 6,135
Two Years Prior 6,122 3,013
Three Years Prior 3,182 5,749
Four Years Prior 5,988 6,505
Prior 23,196 18,318
Revolving Loans 0 0
Recording investment gross of allowance for credit losses 46,919 42,969
Commercial Mortgage Loans | 1.0X to 1.2X    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 346 586
One Years Prior 366 252
Two Years Prior 82 164
Three Years Prior 38 454
Four Years Prior 265 383
Prior 1,713 2,183
Revolving Loans 0 0
Recording investment gross of allowance for credit losses 2,810 4,022
Commercial Mortgage Loans | Less than 1.0X    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 150 0
One Years Prior 152 15
Two Years Prior 82 184
Three Years Prior 55 576
Four Years Prior 320 210
Prior 1,271 1,501
Revolving Loans 0 0
Recording investment gross of allowance for credit losses 2,030 2,486
Agricultural property loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 953 1,606
One Years Prior 1,548 2,079
Two Years Prior 2,052 861
Three Years Prior 824 508
Four Years Prior 490 347
Prior 1,485 1,382
Revolving Loans 74 74
Recording investment gross of allowance for credit losses 7,426 6,857
Agricultural property loans | ≥ 1.2X    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 948 1,593
One Years Prior 1,535 2,035
Two Years Prior 2,040 781
Three Years Prior 750 507
Four Years Prior 489 323
Prior 1,290 1,272
Revolving Loans 74 74
Recording investment gross of allowance for credit losses 7,126 6,585
Agricultural property loans | 1.0X to 1.2X    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 0 5
One Years Prior 5 44
Two Years Prior 4 80
Three Years Prior 58 0
Four Years Prior 0 6
Prior 151 68
Revolving Loans 0 0
Recording investment gross of allowance for credit losses 218 203
Agricultural property loans | Less than 1.0X    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 5 8
One Years Prior 8 0
Two Years Prior 8 0
Three Years Prior 16 1
Four Years Prior 1 18
Prior 44 42
Revolving Loans 0 0
Recording investment gross of allowance for credit losses 82 69
0%-59.99% | Commercial Mortgage Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 1,822 971
One Years Prior 911 1,747
Two Years Prior 2,264 1,282
Three Years Prior 1,437 2,831
Four Years Prior 3,205 4,697
Prior 16,569 15,111
Revolving Loans 0 0
Recording investment gross of allowance for credit losses 26,208 26,639
0%-59.99% | Agricultural property loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 360 931
One Years Prior 880 1,994
Two Years Prior 2,027 853
Three Years Prior 774 461
Four Years Prior 455 326
Prior 1,481 1,348
Revolving Loans 74 74
Recording investment gross of allowance for credit losses 6,051 5,987
60%-69.99% | Commercial Mortgage Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 2,765 1,997
One Years Prior 1,440 3,502
Two Years Prior 2,541 1,553
Three Years Prior 1,107 2,804
Four Years Prior 2,146 1,732
Prior 4,530 3,780
Revolving Loans 0 0
Recording investment gross of allowance for credit losses 14,529 15,368
60%-69.99% | Agricultural property loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 586 675
One Years Prior 668 85
Two Years Prior 25 8
Three Years Prior 50 47
Four Years Prior 20 8
Prior 4 0
Revolving Loans 0 0
Recording investment gross of allowance for credit losses 1,353 823
70%-79.99% | Commercial Mortgage Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 1,001 865
One Years Prior 1,004 1,127
Two Years Prior 1,278 519
Three Years Prior 401 1,025
Four Years Prior 1,013 645
Prior 2,277 1,445
Revolving Loans 0 0
Recording investment gross of allowance for credit losses 6,974 5,626
70%-79.99% | Agricultural property loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 7 0
One Years Prior 0 0
Two Years Prior 0 0
Three Years Prior 0 0
Four Years Prior 0 0
Prior 0 0
Revolving Loans 0 0
Recording investment gross of allowance for credit losses 7 0
80% or greater | Commercial Mortgage Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 145 2
One Years Prior 357 26
Two Years Prior 203 7
Three Years Prior 330 119
Four Years Prior 209 24
Prior 2,804 1,666
Revolving Loans 0 0
Recording investment gross of allowance for credit losses 4,048 1,844
80% or greater | Agricultural property loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 0 0
One Years Prior 0 0
Two Years Prior 0 0
Three Years Prior 0 0
Four Years Prior 15 13
Prior 0 34
Revolving Loans 0 0
Recording investment gross of allowance for credit losses $ 15 $ 47