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Debt Obligations (Changes in Debt Obligations) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Mar. 31, 2016
Nov. 30, 2014
Changes in Debt Obligations [Roll Forward]      
Debt obligations at beginning of period $ 2,364,000,000    
Additions 2,456,000,000    
Payments, Accretion and Other (1,217,000,000)    
Debt obligations at end of period 3,603,000,000    
$400 million senior unsecured term loan facility due November 25, 2019      
Changes in Debt Obligations [Roll Forward]      
Debt obligations at beginning of period 0    
Additions 399,000,000    
Payments, Accretion and Other 0    
Debt obligations at end of period 399,000,000    
Credit facility, borrowing capacity $ 400,000,000 $ 400,000,000  
Interest rate during period 2.00%    
Senior Notes | 5.55% senior unsecured notes due January 15, 2020      
Changes in Debt Obligations [Roll Forward]      
Debt obligations at beginning of period $ 597,000,000    
Additions 0    
Payments, Accretion and Other 1,000,000    
Debt obligations at end of period $ 598,000,000    
Stated rate 5.55%    
Senior Notes | 5.25% senior unsecured notes due January 16, 2018      
Changes in Debt Obligations [Roll Forward]      
Debt obligations at beginning of period $ 368,000,000    
Additions 0    
Payments, Accretion and Other 1,000,000    
Debt obligations at end of period $ 369,000,000    
Stated rate 5.25%    
Senior Notes | 3.875% senior unsecured notes due June 7, 2021      
Changes in Debt Obligations [Roll Forward]      
Debt obligations at beginning of period $ 646,000,000    
Additions 0    
Payments, Accretion and Other (21,000,000)    
Debt obligations at end of period $ 625,000,000    
Stated rate 3.875%    
Senior Notes | 4.25% senior unsecured notes due June 1, 2024      
Changes in Debt Obligations [Roll Forward]      
Debt obligations at beginning of period $ 495,000,000    
Additions 0    
Payments, Accretion and Other 0    
Debt obligations at end of period $ 495,000,000    
Stated rate 4.25%    
Senior Notes | 1.75% senior unsecured notes due May 19, 2023      
Changes in Debt Obligations [Roll Forward]      
Debt obligations at beginning of period $ 0    
Additions 664,000,000    
Payments, Accretion and Other (42,000,000)    
Debt obligations at end of period $ 622,000,000    
Stated rate 1.75%    
Senior Notes | 3.85% senior unsecured notes due June 30, 2026      
Changes in Debt Obligations [Roll Forward]      
Debt obligations at beginning of period $ 0    
Additions 495,000,000    
Payments, Accretion and Other 0    
Debt obligations at end of period $ 495,000,000    
Stated rate 3.85%    
Revolving Credit Facility | $750 million revolving credit commitment due November 25, 2019      
Changes in Debt Obligations [Roll Forward]      
Debt obligations at beginning of period $ 258,000,000    
Additions 898,000,000    
Payments, Accretion and Other (1,156,000,000)    
Debt obligations at end of period 0    
Credit facility, borrowing capacity $ 750,000,000   $ 750,000,000
Interest rate during period 1.63%