|
Long-term Debt (New Long-term Debt Issuances) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended |
|---|---|
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Apr. 30, 2011
|
|
| Long-term debt, Principal Amount | $ 5,000 |
|
1.625% Debt due April 15, 2014 [Member]
|
|
| Long-term debt, Issue Date | April 18, 2011 |
| Long-term debt, Maturity Date | Apr. 15, 2014 |
| Long-term debt, Interest Rate | 1.625% |
| Long-term debt, Principal Amount | 1,000 |
|
2.800% Debt due April 15, 2016 [Member]
|
|
| Long-term debt, Issue Date | April 18, 2011 |
| Long-term debt, Maturity Date | Apr. 15, 2016 |
| Long-term debt, Interest Rate | 2.80% |
| Long-term debt, Principal Amount | 1,000 |
|
4.250% Debt due April 15, 2021 [Member]
|
|
| Long-term debt, Issue Date | April 18, 2011 |
| Long-term debt, Maturity Date | Apr. 15, 2021 |
| Long-term debt, Interest Rate | 4.25% |
| Long-term debt, Principal Amount | 1,000 |
|
5.625% Debt due April 15, 2041 [Member]
|
|
| Long-term debt, Issue Date | April 18, 2011 |
| Long-term debt, Maturity Date | Apr. 15, 2041 |
| Long-term debt, Interest Rate | 5.625% |
| Long-term debt, Principal Amount | $ 2,000 |