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Debt - Issuances (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 12 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended 1 Months Ended 1 Months Ended
Nov. 10, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Nov. 10, 2011
Notes due 2016 2.75% Interest [Member]
Uncollateralized Debt [Member]
Dec. 31, 2013
Notes due 2016 2.75% Interest [Member]
Uncollateralized Debt [Member]
Dec. 31, 2012
Notes due 2016 2.75% Interest [Member]
Uncollateralized Debt [Member]
Nov. 10, 2011
Notes due 2022 4% Interest [Member]
Uncollateralized Debt [Member]
Dec. 31, 2013
Notes due 2022 4% Interest [Member]
Uncollateralized Debt [Member]
Dec. 31, 2012
Notes due 2022 4% Interest [Member]
Uncollateralized Debt [Member]
Nov. 10, 2011
Notes due 2042 5.375% Interest [Member]
Uncollateralized Debt [Member]
Dec. 31, 2013
Notes due 2042 5.375% Interest [Member]
Uncollateralized Debt [Member]
Dec. 31, 2012
Notes due 2042 5.375% Interest [Member]
Uncollateralized Debt [Member]
Mar. 31, 2011
Notes Due 2021 4.5% Interest [Member]
Uncollateralized Debt [Member]
Dec. 31, 2013
Notes Due 2021 4.5% Interest [Member]
Uncollateralized Debt [Member]
Dec. 31, 2012
Notes Due 2021 4.5% Interest [Member]
Uncollateralized Debt [Member]
Mar. 31, 2011
Notes Due 2041 5.875% Interest [Member]
Uncollateralized Debt [Member]
Dec. 31, 2013
Notes Due 2041 5.875% Interest [Member]
Uncollateralized Debt [Member]
Dec. 31, 2012
Notes Due 2041 5.875% Interest [Member]
Uncollateralized Debt [Member]
Debt Disclosure [Abstract]                                      
Net proceeds on issuance of long-term debt $ 2,100 $ 0 $ 0 $ 2,676                              
Debt Instrument [Line Items]                                      
Long-term debt, face value         600     750     750     300     300    
Stated interest rate         2.75% 2.75% 2.75% 4.00% 4.00% 4.00% 5.375% 5.375% 5.375% 4.50% 4.50% 4.50% 5.875% 5.875% 5.875%
Long-term debt, net of discount   $ 5,014 $ 4,986   $ 600 $ 600 $ 600 $ 743 $ 744 $ 743 $ 750 $ 750 $ 750 $ 298 $ 299 $ 299 $ 298 $ 298 $ 298
Effective interest rate         2.936%     4.346%     5.542%     4.683%     6.008%    
Percentage of principal amount to be paid upon redemption         100.00%     100.00%     100.00%     100.00%     100.00%    
Basis Points Added To Treasury Rate         0.30%     0.35%     0.40%     0.20%     0.25%