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Short-term Borrowings and Long-term Debt (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
May 01, 2016
Dec. 31, 2015
Short-term Debt $ 43   $ 40
Line of Credit Facility, Maximum Borrowing Capacity $ 600   600
Debt Instrument, Term 5 years    
Senior Notes [Member]      
Debt Instrument, Face Amount   $ 325  
Debt Instrument, Interest Rate, Stated Percentage   6.15%  
Product Financing Arrangement [Member]      
Short-term Debt $ 43   40
Line of Credit [Member]      
Percentage on limitation of debt to total capitalization under covenant 65.00%    
Ratio of Indebtedness to Net Capital 0.347    
Revolving Credit Facility [Member]      
Loans Outstanding $ 0   0
Letter of Credit [Member]      
Loans Outstanding 3   2
Commercial Paper [Member]      
Loans Outstanding [1] $ 459   $ 219
Debt, Weighted Average Interest Rate 0.76%   0.81%
London Interbank Offered Rate (LIBOR) [Member] | Line of Credit [Member]      
Debt Instrument, Basis Spread on Variable Rate 1.25%    
[1] Weighted average interest rate was 0.76% and 0.81% as of September 30, 2016 and December 31, 2015, respectively.