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Commitments, contingencies, and guarantees (Future Minimum Lease Payments) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]  
2015 $ 108us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2016 94us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2017 77us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2018 58us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
2019 42us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Thereafter 95us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Total minimum future lease commitments $ 474us-gaap_OperatingLeasesFutureMinimumPaymentsDue