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Debt (Components Of Debt) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Nov. 30, 2015
Dec. 19, 2014
Debt Instrument [Line Items]          
Total short-term debt   $ 1 $ 4,501    
Long-term debt   4,728 2,466    
Total debt   4,729 6,967    
Senior Notes [Member] | 7.15% Senior Notes due May 2018 [Member]          
Debt Instrument [Line Items]          
Senior notes   $ 1 1    
Stated interest rate   7.15%      
Maturity date, month and year   2018-05      
Bridge Loan [Member]          
Debt Instrument [Line Items]          
Variable rate (1.515% at December 31, 2014) bridge facility, due December 2015     $ 4,500   $ 4,500
Maturity date, month and year     2015-12    
Variable interest rate     1.515%    
Senior Notes [Member] | 7.35% Senior Notes due October 2017 [Member]          
Debt Instrument [Line Items]          
Senior notes   $ 15 $ 15    
Stated interest rate   7.35%      
Maturity date, month and year   2017-10      
Senior Notes [Member] | 7.125% Senior Notes due October 2017 [Member]          
Debt Instrument [Line Items]          
Senior notes   $ 25 25    
Stated interest rate   7.125%      
Maturity date, month and year   2017-10      
Senior Notes [Member] | 3.3% Senior Notes due January 2018 [Member]          
Debt Instrument [Line Items]          
Senior notes $ 350 $ 350      
Stated interest rate 3.30% 3.30%      
Maturity date, month and year 2018-01 2018-01      
Senior Notes [Member] | 7.5% Senior Notes due February 2018 [Member]          
Debt Instrument [Line Items]          
Senior notes   $ 600 600    
Stated interest rate   7.50%      
Maturity date, month and year   2018-02      
Senior Notes [Member] | 7.15% Senior Notes due May 2018 [Member]          
Debt Instrument [Line Items]          
Senior notes   $ 26 27    
Stated interest rate   7.15%      
Maturity date, month and year   2018-05      
Senior Notes [Member] | 4.05% Senior Notes due January 2020 [Member]          
Debt Instrument [Line Items]          
Senior notes $ 850 $ 850      
Unamortized discount   $ (1)      
Stated interest rate 4.05% 4.05%      
Maturity date, month and year 2020-01 2020-01      
Senior Notes [Member] | 4.10% Senior Notes due March 2022 [Member]          
Debt Instrument [Line Items]          
Senior notes   $ 1,000 1,000    
Unamortized discount   $ (1) (1)    
Stated interest rate   4.10%      
Maturity date, month and year   2022-03      
Senior Notes [Member] | 4.95% Senior Notes due January 2025 [Member]          
Debt Instrument [Line Items]          
Senior notes $ 1,000 $ 1,000      
Unamortized discount   $ (2)      
Stated interest rate 4.95% 4.95%      
Maturity date, month and year 2025-01 2025-01      
Unsecured Debt [Member] | Credit Facility [Member]          
Debt Instrument [Line Items]          
Variable rate (1.886% and 1.515% at December 31, 2015 and December 31, 2014, respectively) credit facility, expires December 2018   $ 116 $ 300    
Credit facility, variable interest rate   1.886% 1.515%    
Credit facility, maturity date   Dec. 01, 2018      
Unsecured Debt [Member] | 1.545% Term Loan due December 2016 [Member]          
Debt Instrument [Line Items]          
Variable rate term loan facility     $ 500    
Maturity date, month and year     2016-12    
Variable interest rate     1.545%    
Unsecured Debt [Member] | 1.775% Term Loan due November 2018 [Member]          
Debt Instrument [Line Items]          
Variable rate term loan facility   $ 750   $ 750  
Maturity date, month and year   2018-11      
Variable interest rate   1.775%