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Debt (2013 Credit Facility - Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended
Apr. 01, 2016
Mar. 30, 2016
Jun. 30, 2016
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2013
Debt Instrument [Line Items]            
Debt instrument       $ 4,659,000,000 $ 4,684,000,000  
Adjusted debt capital structure, percentage       34.00%    
Long-term Debt [Member]            
Debt Instrument [Line Items]            
Debt instrument       $ 4,393,000,000 4,643,000,000  
Long-term Debt [Member] | 2013 Credit Facility [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity     $ 66,000,000     $ 2,000,000,000
Line of credit, amount borrowed   $ 1,550,000,000        
Repayment of line of credit $ 1,550,000,000   285,000,000      
Credit facility, maturity date       Dec. 01, 2018    
Amount outstanding       $ 0    
Debt percentage of adjusted book capital structure covenant       60.00%    
Long-term Debt [Member] | 2016 Credit Facility [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity     743,000,000      
Term Loan 2 due December 2020 [Member] | Long-term Debt [Member]            
Debt Instrument [Line Items]            
Debt instrument     $ 1,191,000,000 $ 1,191,000,000 $ 1,191,000,000