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]
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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.

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