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Investments (Credit Quality Indicators) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Commercial Mortgage Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year $ 1,793 $ 6,021
One Years Prior 4,900 10,264
Two Years Prior 10,036 9,069
Three Years Prior 9,007 7,219
Four Years Prior 7,174 6,831
Prior 26,990 21,332
Recording investment gross of allowance for credit losses 59,900 60,736
Commercial Mortgage Loans | ≥ 1.2X    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 1,682 5,901
One Years Prior 4,780 9,429
Two Years Prior 9,246 8,587
Three Years Prior 8,539 6,954
Four Years Prior 6,911 6,382
Prior 24,234 18,904
Recording investment gross of allowance for credit losses 55,392 56,157
Commercial Mortgage Loans | 1.0X to 1.2X    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 111 118
One Years Prior 113 711
Two Years Prior 666 383
Three Years Prior 380 263
Four Years Prior 261 384
Prior 2,054 1,719
Recording investment gross of allowance for credit losses 3,585 3,578
Commercial Mortgage Loans | Less than 1.0X    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 0 2
One Years Prior 7 124
Two Years Prior 124 99
Three Years Prior 88 2
Four Years Prior 2 65
Prior 702 709
Recording investment gross of allowance for credit losses 923 1,001
Agricultural property loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 399 964
One Years Prior 961 545
Two Years Prior 541 388
Three Years Prior 384 530
Four Years Prior 395 367
Prior 1,414 1,254
Recording investment gross of allowance for credit losses 4,094 4,048
Agricultural property loans | ≥ 1.2X    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 397 941
One Years Prior 939 544
Two Years Prior 540 381
Three Years Prior 376 468
Four Years Prior 336 308
Prior 1,301 1,202
Recording investment gross of allowance for credit losses 3,889 3,844
Agricultural property loans | 1.0X to 1.2X    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 2 23
One Years Prior 22 0
Two Years Prior 0 1
Three Years Prior 2 59
Four Years Prior 59 1
Prior 44 40
Recording investment gross of allowance for credit losses 129 124
Agricultural property loans | Less than 1.0X    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 0 0
One Years Prior 0 1
Two Years Prior 1 6
Three Years Prior 6 3
Four Years Prior 0 58
Prior 69 12
Recording investment gross of allowance for credit losses 76 80
0%-59.99% | Commercial Mortgage Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 446 828
One Years Prior 504 2,693
Two Years Prior 2,614 3,217
Three Years Prior 3,248 3,854
Four Years Prior 3,714 3,223
Prior 17,917 15,360
Recording investment gross of allowance for credit losses 28,443 29,175
0%-59.99% | Agricultural property loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 394 956
One Years Prior 951 494
Two Years Prior 490 349
Three Years Prior 345 527
Four Years Prior 392 367
Prior 1,414 1,254
Recording investment gross of allowance for credit losses 3,986 3,947
60%-69.99% | Commercial Mortgage Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 644 2,678
One Years Prior 2,177 4,981
Two Years Prior 4,885 4,291
Three Years Prior 4,189 2,239
Four Years Prior 2,480 2,667
Prior 6,459 4,058
Recording investment gross of allowance for credit losses 20,834 20,914
60%-69.99% | Agricultural property loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 5 8
One Years Prior 10 51
Two Years Prior 51 39
Three Years Prior 39 3
Four Years Prior 3 0
Prior 0 0
Recording investment gross of allowance for credit losses 108 101
70%-79.99% | Commercial Mortgage Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 697 2,492
One Years Prior 2,219 2,587
Two Years Prior 2,534 1,500
Three Years Prior 1,509 1,057
Four Years Prior 911 918
Prior 2,156 1,409
Recording investment gross of allowance for credit losses 10,026 9,963
70%-79.99% | 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 0 0
Prior 0 0
Recording investment gross of allowance for credit losses 0 0
80% or greater | Commercial Mortgage Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current Year 6 23
One Years Prior 0 3
Two Years Prior 3 61
Three Years Prior 61 69
Four Years Prior 69 23
Prior 458 505
Recording investment gross of allowance for credit losses 597 684
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 0 0
Prior 0 0
Recording investment gross of allowance for credit losses $ 0 $ 0