v3.8.0.1

Investments (Credit Quality Indicators) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Commercial Mortgage Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | $ 52,084 | $ 49,027
Agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 3,203 | 2,958
Commercial mortgage and agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 55,287 | 51,985
0%-59.99% | Commercial Mortgage Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 30,972 | 29,203
0%-59.99% | Agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 3,163 | 2,934
0%-59.99% | Commercial mortgage and agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 34,135 | 32,137
60%-69.99% | Commercial Mortgage Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 14,309 | 13,124
60%-69.99% | Agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 40 | 24
60%-69.99% | Commercial mortgage and agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 14,349 | 13,148
70%-79.99% | Commercial Mortgage Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 6,537 | 6,133
70%-79.99% | Agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 0 | 0
70%-79.99% | Commercial mortgage and agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 6,537 | 6,133
80% or greater | Commercial Mortgage Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 266 | 567
80% or greater | Agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 0 | 0
80% or greater | Commercial mortgage and agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 266 | 567
1.2X | Commercial Mortgage Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 49,827 | 46,495
1.2X | Agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 3,028 | 2,827
1.2X | Commercial mortgage and agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 52,855 | 49,322
1.2X | 0%-59.99% | Commercial Mortgage Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 30,082 | 28,131
1.2X | 0%-59.99% | Agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 2,988 | 2,803
1.2X | 0%-59.99% | Commercial mortgage and agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 33,070 | 30,934
1.2X | 60%-69.99% | Commercial Mortgage Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 13,658 | 12,608
1.2X | 60%-69.99% | Agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 40 | 24
1.2X | 60%-69.99% | Commercial mortgage and agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 13,698 | 12,632
1.2X | 70%-79.99% | Commercial Mortgage Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 5,994 | 5,383
1.2X | 70%-79.99% | Agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 0 | 0
1.2X | 70%-79.99% | Commercial mortgage and agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 5,994 | 5,383
1.2X | 80% or greater | Commercial Mortgage Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 93 | 373
1.2X | 80% or greater | Agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 0 | 0
1.2X | 80% or greater | Commercial mortgage and agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 93 | 373
1.0X to 1.2X | Commercial Mortgage Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 1,737 | 1,603
1.0X to 1.2X | Agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 170 | 114
1.0X to 1.2X | Commercial mortgage and agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 1,907 | 1,717
1.0X to 1.2X | 0%-59.99% | Commercial Mortgage Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 639 | 446
1.0X to 1.2X | 0%-59.99% | Agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 170 | 114
1.0X to 1.2X | 0%-59.99% | Commercial mortgage and agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 809 | 560
1.0X to 1.2X | 60%-69.99% | Commercial Mortgage Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 530 | 401
1.0X to 1.2X | 60%-69.99% | Agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 0 | 0
1.0X to 1.2X | 60%-69.99% | Commercial mortgage and agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 530 | 401
1.0X to 1.2X | 70%-79.99% | Commercial Mortgage Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 514 | 694
1.0X to 1.2X | 70%-79.99% | Agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 0 | 0
1.0X to 1.2X | 70%-79.99% | Commercial mortgage and agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 514 | 694
1.0X to 1.2X | 80% or greater | Commercial Mortgage Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 54 | 62
1.0X to 1.2X | 80% or greater | Agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 0 | 0
1.0X to 1.2X | 80% or greater | Commercial mortgage and agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 54 | 62
1.0X | Commercial Mortgage Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 520 | 929
1.0X | Agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 5 | 17
1.0X | Commercial mortgage and agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 525 | 946
1.0X | 0%-59.99% | Commercial Mortgage Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 251 | 626
1.0X | 0%-59.99% | Agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 5 | 17
1.0X | 0%-59.99% | Commercial mortgage and agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 256 | 643
1.0X | 60%-69.99% | Commercial Mortgage Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 121 | 115
1.0X | 60%-69.99% | Agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 0 | 0
1.0X | 60%-69.99% | Commercial mortgage and agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 121 | 115
1.0X | 70%-79.99% | Commercial Mortgage Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 29 | 56
1.0X | 70%-79.99% | Agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 0 | 0
1.0X | 70%-79.99% | Commercial mortgage and agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 29 | 56
1.0X | 80% or greater | Commercial Mortgage Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 119 | 132
1.0X | 80% or greater | Agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | 0 | 0
1.0X | 80% or greater | Commercial mortgage and agricultural property loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Gross | $ 119 | $ 132

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