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Earnings Per Share (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Abstract]                      
Net income $ 555us-gaap_NetIncomeLoss $ 785us-gaap_NetIncomeLoss $ 779us-gaap_NetIncomeLoss $ 734us-gaap_NetIncomeLoss [1] $ 998us-gaap_NetIncomeLoss $ 916us-gaap_NetIncomeLoss $ 891us-gaap_NetIncomeLoss $ 953us-gaap_NetIncomeLoss $ 2,853us-gaap_NetIncomeLoss $ 3,758us-gaap_NetIncomeLoss $ 2,706us-gaap_NetIncomeLoss
Weighted-average shares outstanding                 335,609,899us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 340,906,490us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 339,843,438us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Share-based compensation plans                 3,376,388us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 3,241,085us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 2,903,512us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Adjusted weighted-average shares outstanding and assumed conversions                 338,986,287us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 344,147,575us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 342,746,950us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per share $ 1.68us-gaap_EarningsPerShareBasic $ 2.35us-gaap_EarningsPerShareBasic $ 2.30us-gaap_EarningsPerShareBasic $ 2.16us-gaap_EarningsPerShareBasic $ 2.93us-gaap_EarningsPerShareBasic $ 2.68us-gaap_EarningsPerShareBasic $ 2.61us-gaap_EarningsPerShareBasic $ 2.80us-gaap_EarningsPerShareBasic $ 8.50us-gaap_EarningsPerShareBasic $ 11.02us-gaap_EarningsPerShareBasic $ 7.96us-gaap_EarningsPerShareBasic
Diluted earnings per share $ 1.66us-gaap_EarningsPerShareDiluted $ 2.32us-gaap_EarningsPerShareDiluted $ 2.28us-gaap_EarningsPerShareDiluted $ 2.14us-gaap_EarningsPerShareDiluted $ 2.90us-gaap_EarningsPerShareDiluted $ 2.66us-gaap_EarningsPerShareDiluted $ 2.59us-gaap_EarningsPerShareDiluted $ 2.77us-gaap_EarningsPerShareDiluted $ 8.42us-gaap_EarningsPerShareDiluted $ 10.92us-gaap_EarningsPerShareDiluted $ 7.89us-gaap_EarningsPerShareDiluted
Potential anti-dilutive share conversions                 1,024,788us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1,031,297us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 896,591us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
[1] (1) Net income for the three months ended December 31, 2014 includes $89 million of net charges related to income taxes to correct prior periods. Such amounts are not material to any period presented.