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Financial Instruments - Long-Term Debt - Footnotes (Details) - Unsecured Debt [Member]
12 Months Ended
Nov. 21, 2016
Jun. 03, 2016
Dec. 31, 2016
Debt Instrument [Line Items]      
Redemption price, percentage 100.00% 100.00% 100.00%
Minimum [Member] | US Treasury Rate [Member]      
Debt Instrument [Line Items]      
Debt redemption price, basis spread percentage 0.10% 0.05% 0.05%
Maximum [Member] | US Treasury Rate [Member]      
Debt Instrument [Line Items]      
Debt redemption price, basis spread percentage 0.20% 0.15% 0.50%
Notes Payable And Other Debt, Weighted Average Interest Rate 3.30%, Due 2018-2021 [Member] | Weighted Average [Member]      
Debt Instrument [Line Items]      
Debt instrument, term     2 years
Notes Payable And Other Debt, Weighted Average Interest Rate 5.99%, Due 2023-2043 [Member]      
Debt Instrument [Line Items]      
Debt instrument, term     16 years