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Equity - Textual (Detail) (USD $)
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12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 6 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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May 20, 2013
Accelerated share repurchase agreement (ASR) [Member]
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Dec. 31, 2013
Treasury Stock [Member]
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Dec. 31, 2012
Treasury Stock [Member]
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Dec. 31, 2011
Treasury Stock [Member]
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Oct. 31, 2013
Treasury Stock [Member]
Accelerated share repurchase agreement (ASR) [Member]
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May 20, 2013
Treasury Stock [Member]
Accelerated share repurchase agreement (ASR) [Member]
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Oct. 31, 2013
Treasury Stock [Member]
Accelerated share repurchase agreement (ASR) [Member]
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| Common stock, shares authorized | 6,500,000,000 | 6,500,000,000 | |||||||||||||
| Preferred stock, shares authorized | 20,000,000 | ||||||||||||||
| Purchases of treasury stock | $ 6,516,000,000 | $ 2,591,000,000 | $ 1,921,000,000 | $ 5,000,000,000 | |||||||||||
| Purchases of treasury stock, shares | 139,000,000 | [1] | 62,000,000 | [1] | 58,000,000 | [1] | 5,500,000 | 99,500,000 | 105,000,000 | ||||||
| Par value preferred stock obligation assumed in connection with 1998 restructuring of AMI | $ 2,400,000,000 | ||||||||||||||
| Preferred stock dividend rate | 5.00% | ||||||||||||||
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