|
Note 6 - Investment in Westinghouse and Related Agreements (Detail)
|
0 Months Ended | 48 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Oct. 16, 2006
USD ($)
|
Oct. 16, 2010
USD ($)
|
Nov. 30, 2012
USD ($)
|
Aug. 31, 2012
USD ($)
|
Oct. 16, 2006
JPY (¥)
|
Oct. 13, 2006
USD ($)
|
Oct. 13, 2006
JPY (¥)
|
Nov. 30, 2012
Toshiba Nuclear Energy Holdings Inc [Member]
USD ($)
|
Nov. 30, 2012
Toshiba Nuclear Energy Holdings Inc [Member]
JPY (¥)
|
Oct. 16, 2006
Toshiba Nuclear Energy Holdings Inc [Member]
|
Nov. 30, 2012
Interest [Member]
USD ($)
|
Nov. 30, 2012
Principal [Member]
USD ($)
|
|
| Equity Method Investment, Ownership Percentage | 20.00% | |||||||||||
| Business Acquisition, Cost of Acquired Entity, Purchase Price | $ 1,100,000,000 | $ 1,100,000,000 | ||||||||||
| Debt Instrument, Face Amount | 1,080,000,000 | 128,980,000,000 | 1,100,000,000 | 128,980,000,000 | 1,519,100,000 | 124,700,000,000 | ||||||
| Proceeds from Issuance of Debt | 1,000,000,000 | 1,000,000,000 | ||||||||||
| Letters of Credit Outstanding, Amount | $ 314,600,000 | $ 329,600,000 | $ 18,200,000 | $ 52,400,000 | ||||||||