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Investments - Securities loaned and Other (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Securities loaned |  |  |
Fixed income and equity securities loaned | $ 1,400 | $ 1,090 |
Interest Income on collateral, net of fees | 4 | 7 | $ 6
Other investment information |  |  |
Other | 3,852 | 3,972 |
Below investment grade assets | 5,230 | 7,570 |
Fixed income securities and short-term investments deposited with regulatory authorities | 147 |  |
Non-income producing fixed income securities and other investments | 99 |  |
Bank loans |  |  |
Other investment information |  |  |
Other | 1,350 | 1,702 |
Policy loans |  |  |
Other investment information |  |  |
Other | 891 | 905 |
Real estate |  |  |
Other investment information |  |  |
Other | 791 | 632 |
Agent loans |  |  |
Other investment information |  |  |
Other | 620 | 538 |
Derivatives and other |  |  |
Other investment information |  |  |
Other | $ 200 | $ 195 |
Shareholders' equity | Concentration of credit risk | Minimum |  |  |
Municipal Bonds |  |  |
Percentage of credit concentration risk of single issuer and affiliates of shareholder's equity | 10.00% |  |
Texas |  |  |
Municipal Bonds |  |  |
Percentage of municipal bonds carrying value | 12.30% | 9.60% |
California |  |  |
Municipal Bonds |  |  |
Percentage of municipal bonds carrying value | 7.40% | 7.00% |
Washington |  |  |
Municipal Bonds |  |  |
Percentage of municipal bonds carrying value | 6.20% | 5.40% |
New York |  |  |
Municipal Bonds |  |  |
Percentage of municipal bonds carrying value | 5.60% | 6.90% |
Florida |  |  |
Municipal Bonds |  |  |
Percentage of municipal bonds carrying value | 4.90% | 6.50% |

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