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Notes Payable and Long-Term Debt - Summary of long-term debt (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 04, 2015 | Aug. 29, 2014 | Sep. 27, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Notes Payable and Long Term Debt |  |  |  |  |  |
Total long-term debt at face value |  |  |  | $ 517 | $ 523 |
Current maturities of long-term debt and unamortized discount |  |  |  | (18) | (5) |
Long-term debt, less current maturities and unamortized discount |  |  |  | 499 | 518 |
Payments of long-term debt |  |  |  | 5 |  | $ 91
Credit Agreement |  |  |  |  |  |
Notes Payable and Long Term Debt |  |  |  |  |  |
Payments of long-term debt |  | $ 86 |  |  |  |
Credit Agreement | Interest expense |  |  |  |  |  |
Notes Payable and Long Term Debt |  |  |  |  |  |
Fee for early payment |  |  | $ 4 |  |  |
Term loan due 2022 |  |  |  |  |  |
Notes Payable and Long Term Debt |  |  |  |  |  |
Total long-term debt at face value |  |  |  | $ 497 | $ 500 |
Face amount | $ 500 |  |  |  |  |
Proceeds from issuance of debt | 499 |  |  |  |  |
Discount | $ 1 |  |  |  |  |
Effective interest rate (as a percent) |  |  |  | 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% |  |  |  | 1.90% |
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 |  |  |  | $ 20 | $ 23 |

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