v2.4.0.8
Debt (Consolidated Debt) (Details) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Commercial Paper [Member]
Dec. 31, 2013
Commercial Paper [Member]
Sep. 30, 2014
Revolving Credit Facility [Member]
Dec. 31, 2013
Revolving Credit Facility [Member]
Sep. 30, 2014
Senior Notes [Member]
6.45% Notes Due 2014 [Member]
Mar. 31, 2014
Senior Notes [Member]
6.45% Notes Due 2014 [Member]
Dec. 31, 2013
Senior Notes [Member]
6.45% Notes Due 2014 [Member]
Sep. 30, 2014
Senior Notes [Member]
5.65% Notes Due 2016 [Member]
Dec. 31, 2013
Senior Notes [Member]
5.65% Notes Due 2016 [Member]
Sep. 30, 2014
Senior Notes [Member]
6.40% Notes Due 2018 [Member]
Dec. 31, 2013
Senior Notes [Member]
6.40% Notes Due 2018 [Member]
Sep. 30, 2014
Senior Notes [Member]
6.55% Notes Due 2019 [Member]
Dec. 31, 2013
Senior Notes [Member]
6.55% Notes Due 2019 [Member]
Sep. 30, 2014
Senior Notes [Member]
4.25% Notes Due 2021 [Member]
Dec. 31, 2013
Senior Notes [Member]
4.25% Notes Due 2021 [Member]
Sep. 30, 2014
Senior Notes [Member]
6.40% Notes Due 2037 [Member]
Dec. 31, 2013
Senior Notes [Member]
6.40% Notes Due 2037 [Member]
Sep. 30, 2014
Senior Notes [Member]
4.20% Notes Due 2042 [Member]
Dec. 31, 2013
Senior Notes [Member]
4.20% Notes Due 2042 [Member]
Sep. 30, 2014
Senior Notes [Member]
5.15% Notes Due 2043 [Member]
Dec. 31, 2013
Senior Notes [Member]
5.15% Notes Due 2043 [Member]
Nov. 30, 2013
Senior Notes [Member]
5.15% Notes Due 2043 [Member]
Debt Offering Part One [Member]
Debt Instrument [Line Items]                                                
Total debt $ 3,003,707,000 $ 2,685,287,000 $ 315,967,000 $ 0 $ 0 $ 0 $ 0   $ 249,971,000 $ 250,864,000 $ 251,183,000 $ 257,796,000 $ 259,346,000 $ 568,789,000 $ 571,515,000 $ 556,535,000 $ 557,213,000 $ 249,012,000 $ 248,998,000 $ 248,399,000 $ 248,377,000 $ 556,345,000 $ 298,684,000  
Weighted-Average Interest Rate 5.00% [1]   0.30% [1],[2]   1.30% [1],[2]   6.30% [1],[2]     5.70% [1]   5.40% [1]   5.70% [1]   4.00% [1]   6.40% [1]   4.20% [1]   5.10% [1],[2]    
Debt Instrument, Face Amount $ 3,000,000,000.0 $ 2,700,000,000.0         $ 0 $ 250,000,000.0 $ 250,000,000.0 $ 250,000,000.0 $ 250,000,000 $ 250,000,000.0 $ 250,000,000 $ 550,000,000.0 $ 550,000,000 $ 550,000,000.0 $ 550,000,000 $ 250,000,000.0 $ 250,000,000 $ 250,000,000.0 $ 250,000,000 $ 550,000,000.0 $ 300,000,000.0 $ 300,000,000.0
Debt Instrument, Interest Rate, Stated Percentage             0.00% 6.45% 6.45% 5.65% 5.65% 6.40% 6.40% 6.55% 6.55% 4.25% 4.25% 6.40% 6.40% 4.20% 4.20% 5.15% 5.15%  
[1] Weighted-average interest rate includes the amortization/accretion of discounts, premiums and gains/losses realized on historical cash flow and fair value hedges recognized as interest expense.
[2] These borrowings were outstanding for only a portion of the nine month period ending September 30, 2014. The weighted-average interest rate for these borrowings was calculated based on the number of days the borrowings were outstanding during the noted period.