Typically making up 20-25% of Berkshire Hathaway's (BRK.A, BRK.B) insurance units' investment holdings ($186.8B AUM), fixed-income assets dropped to just 14% as of the end of the year. Stocks account for $114.8B of the holdings. Cash of $48.2B is up from $47B a year ago and $30.6B at the end of 2009, and of the fixed-income the units do hold, there's a decided tilt away from duration.
Investment income in the insurance units was $3.7B in 2013, but this could drop as nice-yielding deals with Mars, Inc, Swiss Re, Goldman, and GE wound down and Buffett has only been able to replace a portion of that money with equally lucrative plays (i.e., Heinz). “Investment opportunities currently available will likely generate considerably lower yields ... We continue to hold significant cash and cash equivalents earning very low yields.”