Annual report pursuant to Section 13 and 15(d)

Properties and Leases (Minimum Rental Commitments Excluding Executory Costs for Noncancellable Leases) (Details)

v2.4.1.9
Properties and Leases (Minimum Rental Commitments Excluding Executory Costs for Noncancellable Leases) (Details) (USD $)
In Millions, unless otherwise specified
Jan. 31, 2015
Property Plant and Equipment and Leases of Lessee [Abstract]  
2015, Capitalized leases $ 3us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent
2016, Capitalized leases 3us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears
2017, Capitalized leases 3us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears
2018, Capitalized leases 3us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears
2019, Capitalized leases 3us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears
After 2019, Capitalized leases 43us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter
Total minimum lease payments, Capitalized leases 58us-gaap_CapitalLeasesFutureMinimumPaymentsDue
Less amount representing interest 28us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments
Present value of net minimum capitalized lease payments 30us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments
2015, Operating leases 260us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2016, Operating leases 264us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2017, Operating leases 246us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2018, Operating leases 232us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
2019, Operating leases 214us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
After 2019, Operating leases 2,351us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Total minimum lease payments, Operating leases 3,567us-gaap_OperatingLeasesFutureMinimumPaymentsDue
2015, Total 263m_TotalCapitalAndOperatingLeasesFutureMinimumPaymentsDueCurrent
2016, Total 267m_TotalCapitalAndOperatingLeasesFutureMinimumPaymentsDueInTwoYears
2017, Total 249m_TotalCapitalAndOperatingLeasesFutureMinimumPaymentsDueInThreeYears
2018, Total 235m_TotalCapitalAndOperatingLeasesFutureMinimumPaymentsDueInFourYears
2019, Total 217m_TotalCapitalAndOperatingLeasesFutureMinimumPaymentsDueInFiveYears
After 2019, Total 2,394m_TotalCapitalAndOperatingLeasesFutureMinimumPaymentsDueThereafter
Total minimum lease payments, Total $ 3,625m_TotalCapitalAndOperatingLeasesFutureMinimumPaymentsDue