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Amortized Cost and Fair Value of Available-for-Sale and Held-to-Maturity Securities (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Available-for-sale and other debt securities:    
Less than 1 year $ 168us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost [1]  
1-5 years 6,583us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost [1]  
5-10 years 12,784us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost [1]  
Over 10 years 1,441us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost [1]  
Equity securities 701us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost [1]  
Available-for-sale and other securities, Amortized Cost 21,677us-gaap_AvailableForSaleSecuritiesAmortizedCost 18,409us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale and other debt securities:    
Less than 1 year 169us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue [1]  
1-5 years 6,841us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue [1]  
5-10 years 13,190us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue [1]  
Over 10 years 1,505us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue [1]  
Equity securities 703us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue [1]  
Available-for-sale and other securities, fair value 22,408us-gaap_AvailableForSaleSecurities [2] 18,597us-gaap_AvailableForSaleSecurities [2]
Held-to-maturity debt securities:    
Less than 1 year 148us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount [1]  
1-5 years 21us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount [1]  
5-10 years 17us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount [1]  
Over 10 years 1us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount [1]  
Held-to-maturity securities, amortized cost 187us-gaap_HeldToMaturitySecurities [3] 208us-gaap_HeldToMaturitySecurities [3]
Held-to-maturity debt securities:    
Less than 1 year 148us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue [1]  
1-5 years 21us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue [1]  
5-10 years 17us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue [1]  
Over 10 years 1us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue [1]  
Held-to-maturity securities, fair value $ 187us-gaap_HeldToMaturitySecuritiesFairValue $ 208us-gaap_HeldToMaturitySecuritiesFairValue
[1] Actual maturities may differ from contractual maturities when there exists a right to call or prepay obligations with or without call or prepayment penalties.
[2] Amortized cost of $21,677 and $18,409 at December 31, 2014 and 2013, respectively.
[3] Fair value of $187 and $208 at December 31, 2014 and 2013, respectively.