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Debt and Credit Facility Debt and Credity Facility (Narrative) (Details)
$ / shares in Units, shares in Millions
9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Jul. 31, 2010
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
$ / shares
shares
Debt Instrument [Line Items]          
Proceeds from convertible note hedges     $ 600,000,000 $ 1,629,000,000  
Equity component of currently redeemable convertible notes $ 4,000,000   4,000,000   $ 15,000,000
Payments to settle warrants     3,865,000,000 $ 4,093,000,000  
Convertible Senior Notes Due May 2016          
Debt Instrument [Line Items]          
Debt principal repayment, conversion     163,000,000    
Debt Instrument, Convertible, Beneficial Conversion Feature     $ 600,000,000    
Debt Instrument, Convertible, Conversion Ratio 44.3764 44.0428      
Debt Instrument, Face Amount         $ 1,000
Exercise price of warrants or rights (usd per share) | $ / shares $ 22.53   $ 22.53   $ 22.71
2016 Warrants          
Debt Instrument [Line Items]          
Exercise price of warrants or rights (usd per share) | $ / shares $ 29.19   $ 29.19   $ 30.05
Warrants settled during the period | shares     46    
Class of Warrant or Right, Outstanding | shares 9   9   55
Credit Facility Due January 2017          
Debt Instrument [Line Items]          
Long-term line of credit $ 0   $ 0    
Senior Unsecured Notes Due in September 2018          
Debt Instrument [Line Items]          
Basis spread on variable rate     0.125%    
Senior Unsecured Notes Due in September 2018, 2020, 2022, 2035 and March 2026 and 2046 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount $ 10,000,000,000   $ 10,000,000,000    
Debt Issuance Cost     $ 70,000,000    
Senior Unsecured Notes Due in September 2022          
Debt Instrument [Line Items]          
Basis spread on variable rate     0.20%    
Senior Unsecured Notes Due in March 2026          
Debt Instrument [Line Items]          
Basis spread on variable rate     0.25%    
Senior Unsecured Notes Due in September 2020          
Debt Instrument [Line Items]          
Basis spread on variable rate     0.15%    
Senior Unsecured Notes Due in September 2035          
Debt Instrument [Line Items]          
Basis spread on variable rate     0.25%    
Senior Unsecured Notes Due in March 2046          
Debt Instrument [Line Items]          
Basis spread on variable rate     0.30%