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Debt Debt Table (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Line of Credit Facility, Amount Outstanding   $ 238
Short Term Debt 289 200
Debt 6,108 6,306
Long-term Debt, Excluding Current Maturities 5,819 6,106
Senior Note Four Point Seven Five Percent Due in Two Thousand Fourteen [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 0.00%  
Senior Notes   200
Senior Note 4.0% Due in 2015 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.00%  
Senior Notes 289 289
Senior Note 7.3% Due in 2015 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 7.30%  
Senior Notes 167 167
Senior Note 7.5% Due in 2016 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.50%  
Senior Notes 275 275
Senior Note 5.375% Due in 2017 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.375%  
Senior Notes 415 415
Senior Note 4.0% Due in 2017 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.00%  
Senior Notes 295 295
Senior Note 6.3% Due in Two Thousand Eighteen [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 6.30%  
Senior Notes 320 320
Senior Note 6.0% Due in 2019 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 6.00%  
Senior Notes 413 413
Senior Note 5.5% Due in 2020 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.50%  
Senior Notes 499 499
5.125% senior notes due 2022 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.125%  
Senior Notes 796 796
Senior Note 7.65% Due in 2027 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 7.65%  
Senior Notes 80 79
Senior Note 7.375% Due in 2031 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 7.375%  
Senior Notes 63 63
Senior Note 5.95% Due in 2036 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.95%  
Senior Notes 299 298
Senior Note 6.625% Due in 2042 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 6.625%  
Senior Notes 295 295
6.1% senior notes due 2041 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 6.10%  
Senior Notes 326 326
6.625% senior notes due 2042 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 6.625%  
Senior Notes 178 178
Senior Note 4.3% Due in 2042 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.30%  
Senior Notes 298 298
Junior Subordinated Notes 7.75% Due 2042 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 7.875%  
Junior Subordinated Notes 600 600
Junior Subordinate Notes 8.125% Note Due 2068 [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 8.125%  
Junior Subordinated Notes 500 500
Senior Note Four Point Seven Five Percent Due in Two Thousand Fourteen [Member]
   
Debt Instrument [Line Items]    
Senior Notes $ 0