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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

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