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Changes in Ownership Interests and Effect on Stockholders' Equity (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Net loss available to Genworth Financial, Inc.'s common stockholders $ (844) $ 108 $ (484) $ 352
Transfers to the noncontrolling interests:        
Decrease in Genworth Financial, Inc.'s additional paid-in capital for initial sale of Genworth Australia to noncontrolling interests 0   (145)  
Net transfers to noncontrolling interests 0   (145)  
Change from net loss available to Genworth Financial, Inc.'s common stockholders and transfers to noncontrolling interests $ (844)   $ (629)