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Investments (Tables) | 12 Months Ended
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Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Summary of Investments [Table Text Block] | The following is a summary of investments:
| December 31,
2019 |  | 2018
(in millions)
Available-for-Sale securities, at fair value | $ | 33,129 |  |  | $ | 31,058 |
Mortgage loans, net | 2,778 |  |  | 2,696 |
Policy loans | 868 |  |  | 861 |
Other investments | 1,140 |  |  | 1,210 |
Total | $ | 37,915 |  |  | $ | 35,825 |
Summary of Net Investment Income [Table Text Block] | The following is a summary of net investment income:
| Years Ended December 31,
2019 |  | 2018 |  | 2017
(in millions)
Investment income on fixed maturities | $ | 1,378 |  |  | $ | 1,353 |  |  | $ | 1,349 |
Net realized gains (losses) | (8 | ) |  | 10 |  |  | 46 |
Affordable housing partnerships | (98 | ) |  | (58 | ) |  | (100 | )
Other | 97 |  |  | 154 |  |  | 108 |
Consolidated investment entities | 94 |  |  | 137 |  |  | 106 |
Total | $ | 1,463 |  |  | $ | 1,596 |  |  | $ | 1,509 |
Available-for-Sale Securities Disclosure [Table Text Block] | Available-for-Sale securities distributed by type were as follows:
Description of Securities | December 31, 2019
Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Noncredit OTTI (1)
| (in millions)
Corporate debt securities | $ | 10,847 |  |  | $ | 1,344 |  |  | $ | (4 | ) |  | $ | 12,187 |  |  | $ | — |
Residential mortgage backed securities | 9,954 |  |  | 94 |  |  | (19 | ) |  | 10,029 |  |  | — |
Commercial mortgage backed securities | 5,473 |  |  | 96 |  |  | (6 | ) |  | 5,563 |  |  | — |
Asset backed securities | 1,968 |  |  | 42 |  |  | (4 | ) |  | 2,006 |  |  | 1 |
State and municipal obligations | 1,131 |  |  | 238 |  |  | (2 | ) |  | 1,367 |  |  | — |
U.S. government and agency obligations | 1,679 |  |  | 1 |  |  | — |  |  | 1,680 |  |  | — |
Foreign government bonds and obligations | 254 |  |  | 19 |  |  | (2 | ) |  | 271 |  |  | — |
Other securities | 26 |  |  | — |  |  | — |  |  | 26 |  |  | — |
Total | $ | 31,332 |  |  | $ | 1,834 |  |  | $ | (37 | ) |  | $ | 33,129 |  |  | $ | 1 |
Description of Securities | December 31, 2018
Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Noncredit OTTI (1)
| (in millions)
Corporate debt securities | $ | 13,741 |  |  | $ | 555 |  |  | $ | (230 | ) |  | $ | 14,066 |  |  | $ | — |
Residential mortgage backed securities | 6,373 |  |  | 34 |  |  | (78 | ) |  | 6,329 |  |  | — |
Commercial mortgage backed securities | 4,975 |  |  | 18 |  |  | (116 | ) |  | 4,877 |  |  | — |
Asset backed securities | 1,373 |  |  | 36 |  |  | (11 | ) |  | 1,398 |  |  | 1 |
State and municipal obligations | 2,166 |  |  | 192 |  |  | (13 | ) |  | 2,345 |  |  | — |
U.S. government and agency obligations | 1,745 |  |  | — |  |  | — |  |  | 1,745 |  |  | — |
Foreign government bonds and obligations | 298 |  |  | 9 |  |  | (9 | ) |  | 298 |  |  | — |
Total | $ | 30,671 |  |  | $ | 844 |  |  | $ | (457 | ) |  | $ | 31,058 |  |  | $ | 1 |
(1) Represents the amount of other-than-temporary impairment (“OTTI”) losses in AOCI. Amount includes unrealized gains and losses on impaired securities subsequent to the initial impairment measurement date. These amounts are included in gross unrealized gains and losses as of the end of the period.
Investments with Fixed Maturities Disclosure [Table Text Block] | A summary of fixed maturity securities by rating was as follows:
Ratings | December 31, 2019 |  | December 31, 2018
Amortized Cost |  | Fair Value |  | Percent of Total Fair Value | Amortized Cost |  | Fair Value |  | Percent of Total Fair Value
| (in millions, except percentages)
AAA | $ | 18,256 |  |  | $ | 18,437 |  |  | 56 | % |  | $ | 13,399 |  |  | $ | 13,252 |  |  | 43 | %
AA | 1,113 |  |  | 1,304 |  |  | 4 |  |  | 1,571 |  |  | 1,723 |  |  | 5 |
A | 3,008 |  |  | 3,474 |  |  | 10 |  |  | 3,667 |  |  | 3,899 |  |  | 13 |
BBB | 8,178 |  |  | 9,102 |  |  | 28 |  |  | 11,102 |  |  | 11,290 |  |  | 36 |
Below investment grade (1) | 777 |  |  | 812 |  |  | 2 |  |  | 932 |  |  | 894 |  |  | 3 |
Total fixed maturities | $ | 31,332 |  |  | $ | 33,129 |  |  | 100 | % |  | $ | 30,671 |  |  | $ | 31,058 |  |  | 100 | %
(1) The amortized cost and fair value of below investment grade securities includes interest in CLOs managed by the Company of $5 million and $6 million, respectively, as of both December 31, 2019 and 2018. These securities are not rated but are included in below investment grade due to their risk characteristics.
Available-for-Sale Securities Continuous Unrealized Loss Disclosure [Table Text Block] | The following tables provide information about Available-for-Sale securities with gross unrealized losses and the length of time that individual securities have been in a continuous unrealized loss position:
Description of Securities | December 31, 2019
Less than 12 months |  | 12 months or more |  | Total
Number of Securities |  | Fair Value |  | Unrealized Losses | Number of Securities |  | Fair Value |  | Unrealized Losses | Number of Securities |  | Fair Value |  | Unrealized Losses
| (in millions, except number of securities)
Corporate debt securities | 13 |  |  | $ | 66 |  |  | $ | (1 | ) |  | 23 |  |  | $ | 173 |  |  | $ | (3 | ) |  | 36 |  |  | $ | 239 |  |  | $ | (4 | )
Residential mortgage backed securities | 150 |  |  | 4,328 |  |  | (10 | ) |  | 118 |  |  | 1,164 |  |  | (9 | ) |  | 268 |  |  | 5,492 |  |  | (19 | )
Commercial mortgage backed securities | 52 |  |  | 1,622 |  |  | (3 | ) |  | 31 |  |  | 314 |  |  | (3 | ) |  | 83 |  |  | 1,936 |  |  | (6 | )
Asset backed securities | 34 |  |  | 598 |  |  | (3 | ) |  | 16 |  |  | 213 |  |  | (1 | ) |  | 50 |  |  | 811 |  |  | (4 | )
State and municipal obligations | 5 |  |  | 23 |  |  | — |  |  | 4 |  |  | 57 |  |  | (2 | ) |  | 9 |  |  | 80 |  |  | (2 | )
Foreign government bonds and obligations | 1 |  |  | — |  |  | — |  |  | 10 |  |  | 15 |  |  | (2 | ) |  | 11 |  |  | 15 |  |  | (2 | )
Total | 255 |  |  | $ | 6,637 |  |  | $ | (17 | ) |  | 202 |  |  | $ | 1,936 |  |  | $ | (20 | ) |  | 457 |  |  | $ | 8,573 |  |  | $ | (37 | )
Description of Securities | December 31, 2018
Less than 12 months |  | 12 months or more |  | Total
Number of Securities |  | Fair Value |  | Unrealized Losses | Number of Securities |  | Fair Value |  | Unrealized Losses | Number of Securities |  | Fair Value |  | Unrealized Losses
| (in millions, except number of securities)
Corporate debt securities | 345 |  |  | $ | 5,522 |  |  | $ | (152 | ) |  | 148 |  |  | $ | 1,717 |  |  | $ | (78 | ) |  | 493 |  |  | $ | 7,239 |  |  | $ | (230 | )
Residential mortgage backed securities | 142 |  |  | 2,029 |  |  | (18 | ) |  | 175 |  |  | 2,132 |  |  | (60 | ) |  | 317 |  |  | 4,161 |  |  | (78 | )
Commercial mortgage backed securities | 104 |  |  | 2,062 |  |  | (30 | ) |  | 112 |  |  | 1,806 |  |  | (86 | ) |  | 216 |  |  | 3,868 |  |  | (116 | )
Asset backed securities | 38 |  |  | 491 |  |  | (6 | ) |  | 35 |  |  | 396 |  |  | (5 | ) |  | 73 |  |  | 887 |  |  | (11 | )
State and municipal obligations | 81 |  |  | 255 |  |  | (4 | ) |  | 100 |  |  | 254 |  |  | (9 | ) |  | 181 |  |  | 509 |  |  | (13 | )
Foreign government bonds and obligations | 17 |  |  | 86 |  |  | (4 | ) |  | 14 |  |  | 17 |  |  | (5 | ) |  | 31 |  |  | 103 |  |  | (9 | )
Total | 727 |  |  | $ | 10,445 |  |  | $ | (214 | ) |  | 584 |  |  | $ | 6,322 |  |  | $ | (243 | ) |  | 1,311 |  |  | $ | 16,767 |  |  | $ | (457 | )
Credit Losses on Available-for-Sale Securities Disclosure [Table Text Block] | The following table presents a rollforward of the cumulative amounts recognized in the Consolidated Statements of Operations for OTTI related to credit losses on Available-for-Sale securities for which a portion of the securities’ total OTTI was recognized in OCI:
| December 31,
2019 |  | 2018 |  | 2017
(in millions)
Beginning balance | $ | 2 |  |  | $ | 2 |  |  | $ | 69 |
Credit losses for which an other-than-temporary impairment was not previously recognized | 15 |  |  | — |  |  | — |
Credit losses for which an other-than-temporary impairment was previously recognized | 2 |  |  | — |  |  | 1 |
Reductions for securities sold during the period (realized) | (1 | ) |  | — |  |  | (68 | )
Ending balance | $ | 18 |  |  | $ | 2 |  |  | $ | 2 |
Available-for-Sale Securities Recognized in Earnings Disclosure [Table Text Block] | Net realized gains and losses on Available-for-Sale securities, determined using the specific identification method, recognized in earnings were as follows:
| Years Ended December 31,
2019 |  | 2018 |  | 2017
(in millions)
Gross realized investment gains | $ | 30 |  |  | $ | 18 |  |  | $ | 63 |
Gross realized investment losses | (14 | ) |  | (9 | ) |  | (7 | )
Other-than-temporary impairments | (22 | ) |  | — |  |  | (1 | )
Total | $ | (6 | ) |  | $ | 9 |  |  | $ | 55 |
Available-for-Sale Securities Contractual Maturity Disclosure [Table Text Block] | Available-for-Sale securities by contractual maturity as of December 31, 2019 were as follows:
| Amortized Cost |  | Fair Value
(in millions)
Due within one year | $ | 2,471 |  |  | $ | 2,476 |
Due after one year through five years | 4,723 |  |  | 4,900 |
Due after five years through 10 years | 2,667 |  |  | 2,890 |
Due after 10 years | 4,076 |  |  | 5,265 |
| 13,937 |  |  | 15,531 |
Residential mortgage backed securities | 9,954 |  |  | 10,029 |
Commercial mortgage backed securities | 5,473 |  |  | 5,563 |
Asset backed securities | 1,968 |  |  | 2,006 |
Total | $ | 31,332 |  |  | $ | 33,129 |

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