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Notes Payable and Long-Term Debt - Summary of long-term debt (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 04, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Notes Payable and Long Term Debt |  |  |
Total long-term debt at face value |  | $ 536 | $ 517
Current maturities of long-term debt and unamortized discount |  | (54) | (18)
Long-term debt, less current maturities and unamortized discount |  | 482 | 499
Payments of long-term debt |  | 17 | 5
Term loan due 2022 |  |  |
Notes Payable and Long Term Debt |  |  |
Total long-term debt at face value |  | $ 484 | $ 497
Face amount | $ 500 |  |
Proceeds from issuance of debt | 499 |  |
Discount | $ 1 |  |
Effective interest rate (as a percent) |  | 3.20% | 2.40%
Adjusted leverage ratio, maximum | 50.00% |  |
Minimum net worth base requirement | $ 2,000 |  |
Percentage of consolidated net income added to net worth base amount | 25.00% |  |
Maximum dividends per year | $ 25 |  |
Sum of subsidiary indebtedness and priority indebtedness as a percentage of consolidated tangible net worth, maximum | 15.00% |  |
Term loan due 2022 | Federal Funds Effective Rate |  |  |
Notes Payable and Long Term Debt |  |  |
Basis spread on variable rate (as a percent) | 0.50% |  |
Term loan due 2022 | LIBOR |  |  |
Notes Payable and Long Term Debt |  |  |
Basis spread on variable rate (as a percent) | 1.00% |  |
Variable rate basis |  | one month |
Foreign subsidiary obligations due 2018 through 2023 |  |  |
Notes Payable and Long Term Debt |  |  |
Total long-term debt at face value |  | $ 52 | $ 20

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