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Significant Accounting Policies (Dividends) (Details) (Berkshire Hathaway [Member], Preferred Stock [Member], USD $)
In Billions, unless otherwise specified |
Dec. 29, 2013
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|---|---|
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Berkshire Hathaway [Member] | Preferred Stock [Member]
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| Class of Stock [Line Items] | |
| Equity Method Investment, Summarized Financial Information, Redeemable Preferred Stock | $ 8.0 |
| Dividends Payable, Annual, Percent | 9.00% |