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Investments - Securities loaned and Other (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Securities loaned |  |  |
Fixed income and equity securities loaned | $ 1,090 | $ 1,080 |
Interest Income on collateral, net of fees | 7 | 6 | $ 2
Other investment information |  |  |
Below investment grade assets | 7,570 | $ 8,620 |
Fixed income securities and short-term investments deposited with regulatory authorities | 154 |  |
Non-income producing fixed income securities and other investments | $ 51 |  |
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 | 9.60% | 10.00% |
California |  |  |
Municipal Bonds |  |  |
Percentage of municipal bonds carrying value | 7.00% | 7.20% |
New York |  |  |
Municipal Bonds |  |  |
Percentage of municipal bonds carrying value | 6.90% | 6.80% |
Florida |  |  |
Municipal Bonds |  |  |
Percentage of municipal bonds carrying value | 6.50% | 5.70% |
Washington |  |  |
Municipal Bonds |  |  |
Percentage of municipal bonds carrying value | 5.40% | 5.60% |
Michigan |  |  |
Municipal Bonds |  |  |
Percentage of municipal bonds carrying value | 4.20% | 5.40% |

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