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OTTI Losses on Available for Sale Securities (Detail) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Net impairment losses recognized in earnings$ 0$ 0$ 2$ 2
Mortgage-backed Securities, Issued by Private Enterprises
    
Total OTTI losses0032
Portion of losses recognized in OCI (before taxes)0[1]0[1](1)[1]0[1]
Net impairment losses recognized in earnings$ 0$ 0$ 2$ 2
[1]The initial OTTI amount represents the excess of the amortized cost over the fair value of AFS debt securities. For subsequent impairments of the same security, amount represents additional declines in the fair value subsequent to the previously recorded OTTI, if applicable, until such time the security is no longer in an unrealized loss position.