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Summary of Performance Share Plan Activity (Detail) (USD $)
9 Months Ended
Sep. 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 (2,862,314) [1]
Forfeited, Nonvested Shares / Units (154,084)
Outstanding Ending Balance, Nonvested Shares / Units 8,685,572
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 $ 16.80 [1]
Forfeited, Weighted Average Grant Date Fair Value $ 28.95
Outstanding Ending Balance, Weighted Average Grant Date Fair Value $ 28.37
[1] Includes 63,745 shares/units held for payout at the end of the performance period.