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Summary of Performance Share Plan Activity (Detail) (USD $)
6 Months Ended
Jun. 30, 2013
Nonvested Shares  
Outstanding Beginning Balance, Nonvested Shares / Units 8,660,855
Granted, Nonvested Shares / Units 3,148,445
Shares Issued, Nonvested Shares / Units (3,057,113) [1]
Forfeited, Nonvested Shares / Units (217,773)
Outstanding Ending Balance, Nonvested Shares / Units 8,534,414
Weighted Average Grant Date Fair Value  
Outstanding Beginning Balance, Weighted Average Grant Date Fair Value $ 28.37
Granted, Weighted Average Grant Date Fair Value $ 40.76
Shares Issued, Weighted Average Grant Date Fair Value $ 32.59 [1]
Forfeited, Weighted Average Grant Date Fair Value $ 34.42
Outstanding Ending Balance, Weighted Average Grant Date Fair Value $ 31.28
[1] Includes 150,895 units held for payout at the end of the performance period.