Warren Buffett's Berkshire Hathaway (BRK.A) - Get BRK.A Report (BRK.B) - Get Berkshire Hathaway Inc. Class B Report was upgraded to a "stable" rating outlook at S&P (SPGI) - Get S&P Global, Inc. Report from a "watch negative" outlook on Tuesday.

The upgrade comes after Berkshire's deal with Energy Future Holdings Corp to acquire its Oncor Electric Delivery interest was terminated Monday. Sempra Energy (SRE) - Get Sempra Energy Report agreed to buy Oncor for $9.45 billion, besting Berkshire's $9 billion offer.

Berkshire remains a "AA" credit rating at S&P. Berkshire's class B stock traded up 0.6% to $179.33 late-morning Tuesday.

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