| Schedule of Variable Annuity Guarantees [Table Text Block] |
The following table provides information related to variable annuity guarantees for which the Company has established additional liabilities: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Variable Annuity Guarantees by Benefit Type (1) | March 31, 2018 | | December 31, 2017 | Total Contract Value | | Contract Value in Separate Accounts | | Net Amount at Risk | | Weighted Average Attained Age | Total Contract Value | | Contract Value in Separate Accounts | | Net Amount at Risk | | Weighted Average Attained Age | | (in millions, except age) | GMDB: | | | | | | | | | | | | | | | | Return of premium | $ | 60,402 |
| | $ | 58,458 |
| | $ | 30 |
| | 66 | | $ | 61,418 |
| | $ | 59,461 |
| | $ | 9 |
| | 66 | Five/six-year reset | 8,603 |
| | 5,890 |
| | 18 |
| | 66 | | 8,870 |
| | 6,149 |
| | 12 |
| | 66 | One-year ratchet | 6,330 |
| | 5,970 |
| | 43 |
| | 69 | | 6,548 |
| | 6,187 |
| | 11 |
| | 69 | Five-year ratchet | 1,507 |
| | 1,451 |
| | 2 |
| | 65 | | 1,563 |
| | 1,506 |
| | 1 |
| | 65 | Other | 1,088 |
| | 1,066 |
| | 64 |
| | 72 | | 1,099 |
| | 1,075 |
| | 50 |
| | 72 | Total — GMDB | $ | 77,930 |
| | $ | 72,835 |
| | $ | 157 |
| | 66 | | $ | 79,498 |
| | $ | 74,378 |
| | $ | 83 |
| | 66 | | | | | | | | | | | | | | | | | GGU death benefit | $ | 1,093 |
| | $ | 1,041 |
| | $ | 126 |
| | 70 | | $ | 1,118 |
| | $ | 1,067 |
| | $ | 133 |
| | 70 | | | | | | | | | | | | | | | | | GMIB | $ | 219 |
| | $ | 202 |
| | $ | 8 |
| | 69 | | $ | 233 |
| | $ | 216 |
| | $ | 7 |
| | 69 | | | | | | | | | | | | | | | | | GMWB: | | | | | | | | | | | | | | | | GMWB | $ | 2,386 |
| | $ | 2,378 |
| | $ | 1 |
| | 71 | | $ | 2,508 |
| | $ | 2,500 |
| | $ | 1 |
| | 71 | GMWB for life | 43,837 |
| | 43,729 |
| | 194 |
| | 67 | | 44,375 |
| | 44,259 |
| | 129 |
| | 67 | Total — GMWB | $ | 46,223 |
| | $ | 46,107 |
| | $ | 195 |
| | 67 | | $ | 46,883 |
| | $ | 46,759 |
| | $ | 130 |
| | 67 | | | | | | | | | | | | | | | | | GMAB | $ | 2,914 |
| | $ | 2,911 |
| | $ | 2 |
| | 59 | | $ | 3,086 |
| | $ | 3,083 |
| | $ | — |
| | 59 |
| | (1) | Individual variable annuity contracts may have more than one guarantee and therefore may be included in more than one benefit type. Variable annuity contracts for which the death benefit equals the account value are not shown in this table. |
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| Schedule of Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees [Table Text Block] |
Changes in additional liabilities (contra liabilities) for variable annuity and insurance guarantees were as follows: | | | | | | | | | | | | | | | | | | | | | | GMDB & GGU | | GMIB | | GMWB (1) | | GMAB (1) | | UL | (in millions) | Balance at January 1, 2017 | $ | 16 |
| | $ | 8 |
| | $ | 1,017 |
| | $ | (24 | ) | | $ | 434 |
| Incurred claims | 1 |
| | — |
| | (380 | ) | | (29 | ) | | 23 |
| Paid claims | (1 | ) | | (1 | ) | | — |
| | — |
| | (8 | ) | Balance at March 31, 2017 | $ | 16 |
| | $ | 7 |
| | $ | 637 |
| | $ | (53 | ) | | $ | 449 |
| | | | | | | | | | | Balance at January 1, 2018 | $ | 17 |
| | $ | 6 |
| | $ | 463 |
| | $ | (80 | ) | | $ | 489 |
| Incurred claims | 1 |
| | — |
| | (261 | ) | | 4 |
| | 26 |
| Paid claims | (1 | ) | | — |
| | — |
| | — |
| | (7 | ) | Balance at March 31, 2018 | $ | 17 |
| | $ | 6 |
| | $ | 202 |
| | $ | (76 | ) | | $ | 508 |
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(1) The incurred claims for GMWB and GMAB represent the change in the fair value of the liabilities (contra liabilities) less paid claims. |
| Schedule of Separate Account Balances by Asset Type [Table Text Block] |
The following table summarizes the distribution of separate account balances by asset type for variable annuity contracts providing guaranteed benefits: | | | | | | | | | | March 31,
2018 | | December 31,
2017 | (in millions) | Mutual funds: | | | | Equity | $ | 44,619 |
| | $ | 46,038 |
| Bond | 22,867 |
| | 23,529 |
| Other | 5,631 |
| | 5,109 |
| Total mutual funds | $ | 73,117 |
| | $ | 74,676 |
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