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Debt (Details) - USD ($)
3 Months Ended 9 Months Ended
Jan. 03, 2017
Jun. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Debt Instrument [Line Items]        
Debt Instrument Carrying Amount   $ 3,085,000,000 $ 2,460,000,000 $ 3,085,000,000
Debt Instrument, Unamortized Discount (Premium), Net   (4,370,000) 4,270,000 (4,370,000)
Debt Issuance Costs, Net   22,636,000 16,951,000 22,636,000
Current maturities of long-term debt   0 250,000,000 0
Long-term debt   3,066,734,000 2,188,779,000 3,066,734,000
Loss on settlement of interest rate swaps   37,000,000   37,000,000
Line Of Credit Facility [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity   1,500,000,000   1,500,000,000
Long Term Debt Other Disclosures [Abstract]        
Term Loan Agreement, Maximum Borrowing Capacity   200,000,000   200,000,000
Term Loan Agreement, Incremental Borrowings   1,000,000   1,000,000
Term Loan Agreement, Amount Outstanding   125,000,000   125,000,000
Commercial Paper   $ 258,600,000 829,800,000 $ 258,600,000
Required by Covenant [Member]        
Line Of Credit Facility [Line Items]        
Ratio of Total Debt to Total Capital   70.00%   70.00%
Actual [Member]        
Line Of Credit Facility [Line Items]        
Ratio of Total Debt to Total Capital   47.00%   47.00%
Minimum [Member] | Required by Covenant [Member]        
Line Of Credit Facility [Line Items]        
Excess of Debt   $ 15,000,000   $ 15,000,000
Maximum [Member] | Required by Covenant [Member]        
Line Of Credit Facility [Line Items]        
Excess of Debt   100,000,000   100,000,000
Five Year Unsecured Revolving Credit Agreement [Member] | Commercial Paper [Member] | Regulated Operation [Member]        
Line Of Credit Facility [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity   1,500,000,000 1,250,000,000.00 1,500,000,000
Line of Credit Facility, Accordion Feature   250,000,000   250,000,000
Line of Credit Facility, Maximum Borrowing Capacity with Accordion Feature   $ 1,750,000,000.00   1,750,000,000.00
Five Year Unsecured Revolving Credit Agreement [Member] | Commercial Paper [Member] | Minimum [Member] | Regulated Operation [Member]        
Line Of Credit Facility [Line Items]        
Debt Instrument, Basis Spread on Variable Rate   0.00%    
Five Year Unsecured Revolving Credit Agreement [Member] | Commercial Paper [Member] | Maximum [Member] | Regulated Operation [Member]        
Line Of Credit Facility [Line Items]        
Debt Instrument, Basis Spread on Variable Rate   1.25%    
$15 Million Revolving Credit Note [Member] | Unsecured Revolving Credit Note [Member] | Unregulated Operation [Member]        
Line Of Credit Facility [Line Items]        
Extinguishment of Debt, Amount $ 15,000,000      
$25 Million Bank Loan Agreement [Member] | Unsecured Loan Agreement [Member] | Regulated Operation [Member]        
Line Of Credit Facility [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity   $ 25,000,000   25,000,000
Line of Credit Facility, Fair Value of Amount Outstanding   0   0
$10 Million Revolving Credit Note [Member] | Unsecured Revolving Credit Note [Member] | Regulated Operation [Member]        
Line Of Credit Facility [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity   10,000,000   10,000,000
Line of Credit Facility, Remaining Borrowing Capacity   4,100,000   4,100,000
Line of Credit Facility, Fair Value of Amount Outstanding   0   0
$25 Million Uncommitted Facility [Member] | Uncommitted Revolving Credit Facility [Member] | Unregulated Operation [Member]        
Line Of Credit Facility [Line Items]        
Extinguishment of Debt, Amount $ 25,000,000      
Unsecured Senior Notes Due 2017 [Member]        
Debt Instrument [Line Items]        
Debt Instrument Carrying Amount   $ 0 $ 250,000,000 $ 0
Debt Instrument, Interest Rate, Stated Percentage   6.35% 6.35% 6.35%
Debt Instrument, Maturity Date   Jun. 15, 2017 Jun. 15, 2017  
Unsecured Senior Notes Due 2019 [Member]        
Debt Instrument [Line Items]        
Debt Instrument Carrying Amount   $ 450,000,000 $ 450,000,000 $ 450,000,000
Debt Instrument, Interest Rate, Stated Percentage   8.50% 8.50% 8.50%
Debt Instrument, Maturity Date   Mar. 15, 2019 Mar. 15, 2019  
Unsecured Senior Notes Due 2034 [Member]        
Debt Instrument [Line Items]        
Debt Instrument Carrying Amount   $ 200,000,000 $ 200,000,000 $ 200,000,000
Debt Instrument, Interest Rate, Stated Percentage   5.95% 5.95% 5.95%
Debt Instrument, Maturity Date   Oct. 15, 2034 Oct. 15, 2034  
Unsecured Senior Notes Due 2041 [Member]        
Debt Instrument [Line Items]        
Debt Instrument Carrying Amount   $ 400,000,000 $ 400,000,000 $ 400,000,000
Debt Instrument, Interest Rate, Stated Percentage   5.50% 5.50% 5.50%
Debt Instrument, Maturity Date   Jun. 15, 2041 Jun. 15, 2041  
Unsecured Senior Notes Due 2043 [Member]        
Debt Instrument [Line Items]        
Debt Instrument Carrying Amount   $ 500,000,000 $ 500,000,000 $ 500,000,000
Debt Instrument, Interest Rate, Stated Percentage   4.15% 4.15% 4.15%
Debt Instrument, Maturity Date   Jan. 15, 2043 Jan. 15, 2043  
Unsecured Senior Notes Due 2044 [Member]        
Debt Instrument [Line Items]        
Debt Instrument Carrying Amount   $ 750,000,000 $ 500,000,000 $ 750,000,000
Debt Instrument, Interest Rate, Stated Percentage   4.125% 4.125% 4.125%
Debt Instrument, Maturity Date   Oct. 15, 2044 Oct. 15, 2044  
Debt Instrument, Interest Rate, Effective Percentage   4.40%   4.40%
Debt Instrument, Increase (Decrease), Net   $ 250,000,000    
Medium Term Notes Due 2025 [Member]        
Debt Instrument [Line Items]        
Debt Instrument Carrying Amount   $ 10,000,000 $ 10,000,000 $ 10,000,000
Debt Instrument, Interest Rate, Stated Percentage   6.67% 6.67% 6.67%
Debt Instrument, Maturity Date   Dec. 15, 2025 Dec. 15, 2025  
Unsecured Debentures Due 2028 [Member]        
Debt Instrument [Line Items]        
Debt Instrument Carrying Amount   $ 150,000,000 $ 150,000,000 $ 150,000,000
Debt Instrument, Interest Rate, Stated Percentage   6.75% 6.75% 6.75%
Debt Instrument, Maturity Date   Jul. 15, 2028 Jul. 15, 2028  
Multi-Draw Term Loan Due 2019 [Member]        
Debt Instrument [Line Items]        
Debt Instrument Carrying Amount   $ 125,000,000 $ 0 $ 125,000,000
Debt Instrument, Maturity Date   Jun. 24, 2019    
Unsecured Senior Notes Due 2027 [Member]        
Debt Instrument [Line Items]        
Debt Instrument Carrying Amount   $ 500,000,000 $ 0 $ 500,000,000
Debt Instrument, Interest Rate, Stated Percentage   3.00% 3.00% 3.00%
Debt Instrument, Maturity Date   Jun. 15, 2027 Jun. 15, 2027  
Debt Instrument, Interest Rate, Effective Percentage   3.12%   3.12%
Net Proceeds From Issuance of Debt       $ 753,000,000