NEW YORK (Standard&Poor's) Jan. 31, 2013--Standard&Poor's Ratings Services said today that it assigned its 'AA+' senior debt ratings to Berkshire Hathaway Inc.'s (BRK; AA+/Negative/A-1+) $2.6 billion senior unsecured notes. BRK will issue the notes in four tranches: $300 million 0.8% senior unsecured notes due Feb. 11, 2016; $800 million 1.55% senior unsecured notes due Feb. 9, 2018; $500 million 3.0% senior unsecured notes due Feb. 11, 2023; and $1.0 billion 4.5% senior unsecured notes due Feb. 11, 2043. BRK will use the net proceeds of this issuance to repay $2.6 billion of notes maturing on Feb. 11, 2013. BRK's adjusted debt leverage and interest coverage (excluding the separately rated subsidiaries MidAmerican Energy Holdings Co. and Burlington
