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Financing and Additional Notes and Loans Payable Information (Parenthetical) (Detail)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Weighted average interest rate on short-term borrowings 1.80% 1.50% 0.90%
Average effective rate for affiliate long-term borrowing 2.20% 2.00% 1.30%