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Debt Obligations and Commitments - Additional Information (Detail) (USD $)
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3 Months Ended | |||||||
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Jun. 16, 2012
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Jun. 16, 2012
Four-Year Credit Agreement
Before Amendment
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Jun. 16, 2012
Four-Year Credit Agreement
After Amendment
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Jun. 16, 2012
364-Day Credit Agreement
Before Amendment
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Jun. 16, 2012
364-Day Credit Agreement
After Amendment
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Mar. 24, 2012
0.750% Senior Notes
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Mar. 24, 2012
2.750% Senior Notes
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Mar. 24, 2012
4.000% Senior Notes
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| Debt Instrument [Line Items] | ||||||||
| Fixed and floating rate notes issued | $ 750,000,000 | $ 1,250,000,000 | $ 750,000,000 | |||||
| Interest rate on debt | 0.75% | 2.75% | 4.00% | |||||
| Debt instrument maturity year | 2015 | 2022 | 2042 | |||||
| Extended termination date of unsecured credit agreement | Jun. 14, 2015 | Jun. 14, 2016 | Jun. 12, 2012 | Jun. 11, 2013 | ||||
| Commercial paper outstanding | $ 3,300,000,000 | |||||||