Subsequent event (Notes)

3 Months Ended

Mar. 31, 2013

Subsequent Events [Abstract]

Subsequent Events [Text Block]

(21) Subsequent Event

On May 2, 2013, the Company issued $350 million aggregate principal amount of 5.625% Subordinated Debentures due 2053. Net proceeds from this offering will be used for the repayment of $250 million principal amount of the Company's 6.750% Subordinated Debentures due 2045 on May 26, 2013, which were called for redemption on April 26, 2013; the remainder will be used for general corporate purposes.