XML 64 R111.htm IDEA: XBRL DOCUMENT v2.4.0.8
Accumulated Other Comprehensive Income - Summary of Income Tax Benefit (Obligation) to Component of Other Comprehensive Income (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Equity [Abstract]      
Balance, beginning of year $ (13) $ 12 $ (15)
Net unrealized loss (gain) 11 (30) 18
Reclassification of net gain to net income 6 5 9
Balance, end of year 4 (13) 12
Balance, beginning of year 36 24 1
Net unrealized (gain) loss (21) 15 25
Reclassification of net loss to net income (1) (3) (2)
Balance, end of year 14 36 24
Total income tax benefit $ 18 $ 23 $ 36