Quarterly report pursuant to Section 13 or 15(d)

Activity Related to Noncontrolling Interests (Detail)

v2.4.0.8
Activity Related to Noncontrolling Interests (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Noncontrolling Interest [Line Items]    
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests $ 1 $ (65)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]    
Balance at beginning of period 14 80
Dividends attributable to noncontrolling interests 0 0
Net income attributable to noncontrolling interests 0 0
Balance at end of period $ 15 $ 15