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Common Stock (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Employee Stock Option [Member]
Dec. 31, 2012
Employee Stock Option [Member]
Dec. 31, 2013
QUIPS [Member]
Dec. 31, 2012
QUIPS [Member]
Dec. 31, 2013
4 percent Convertible Senior Notes [Member]
Dec. 31, 2012
4 percent Convertible Senior Notes [Member]
Dec. 31, 2013
4 percent Convertible Senior Notes [Member]
Dec. 31, 2012
4 percent Convertible Senior Notes [Member]
Dec. 31, 2011
4 percent Convertible Senior Notes [Member]
Nov. 30, 2009
4 percent Convertible Senior Notes [Member]
Dec. 31, 2013
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2012
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2011
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2013
Time-based Restricted Stock Units [Member]
Mar. 31, 2014
Scenario, Forecast [Member]
4 percent Convertible Senior Notes [Member]
Class of Stock [Line Items]                                  
Common stock, shares authorized 500,000,000 500,000,000                              
Common stock, par value $ 0.01 $ 0.01                              
Common stock, capital shares reserved for future issuance     900,000 1,300,000 0 1,300,000 17,500,000 18,900,000                  
Stated interest rate                 4.00% 4.00% 4.00% 4.00%          
Debt instrument, convertible, conversion price                 $ 11.11                
Redemption notice amount                                 $ 56
Restricted stock units outstanding (in shares)                         1,100,000        
Restricted stock units outstanding                         763,000 901,000      
Number of shares available for grant 1,800,000                                
Options, outstanding, intrinsic value 53                                
Options, exercisable, intrinsic value 45                                
Share conversion ratio                         1        
Vesting period                               3 years  
Vesting period, start duration from grant date                               12 months  
Shares issued for RSUs                         603,000        
Shares paid for tax withholding                         369,000        
Compensation expense not yet recognized                         22        
Compensation expense not yet recognized, period for recognition                         1 year 9 months 18 days        
Fair value of RSUs vested during the period                         $ 53 $ 43 $ 22