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Summary of Activity of Executive Continuity and Restricted Stock Award Program (Detail) (USD $)
6 Months Ended
Jun. 30, 2012
Nonvested Shares  
Outstanding Beginning Balance, Nonvested Shares / Units 8,060,059
Granted, Nonvested Shares / Units 3,641,911
Shares Issued, Nonvested Shares / Units (2,832,849) [1]
Forfeited, Nonvested Shares / Units (78,285)
Outstanding Ending Balance, Nonvested Shares / Units 8,790,836
Weighted Average Grant Date Fair Value  
Outstanding Beginning Balance, Weighted Average Grant Date Fair Value $ 22.83
Granted, Weighted Average Grant Date Fair Value $ 31.57
Shares Issued, Weighted Average Grant Date Fair Value $ 16.68 [1]
Forfeited, Weighted Average Grant Date Fair Value $ 28.96
Outstanding Ending Balance, Weighted Average Grant Date Fair Value $ 28.38
Executive Continuity And Restricted Stock Award Program
 
Nonvested Shares  
Outstanding Beginning Balance, Nonvested Shares / Units 128,917
Granted, Nonvested Shares / Units 70,715
Shares Issued, Nonvested Shares / Units (24,250)
Forfeited, Nonvested Shares / Units 0
Outstanding Ending Balance, Nonvested Shares / Units 175,382
Weighted Average Grant Date Fair Value  
Outstanding Beginning Balance, Weighted Average Grant Date Fair Value $ 27.86
Granted, Weighted Average Grant Date Fair Value $ 32.05
Shares Issued, Weighted Average Grant Date Fair Value $ 26.88
Forfeited, Weighted Average Grant Date Fair Value $ 0
Outstanding Ending Balance, Weighted Average Grant Date Fair Value $ 29.69
[1] Includes 34,280 shares/units held for payout at the end of the performance period.