Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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Debt and lines of credit (Details) (USD $)	3 Months Ended		1 Months Ended
Debt and lines of credit (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014	May 31, 2014	Mar. 31, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity until March 2020	$ 2,000,000,000
Commercial paper	0us-gaap_CommercialPaper
Long-term debt, gross	4,625,000,000us-gaap_DebtInstrumentCarryingAmount				4,625,000,000us-gaap_DebtInstrumentCarryingAmount
Proceeds from issuance of long-term debt	0	498,000,000
Interest and debt expense	22,000,000us-gaap_InterestAndDebtExpense	25,000,000us-gaap_InterestAndDebtExpense
Notes payable
Debt Instrument [Line Items]
Long-term debt, gross		500,000,000		500,000,000
Payments of debt issuance costs				3,000,000
Proceeds from issuance of long-term debt				498,000,000
Repayments of long-term debt			1,000,000,000
Notes due 2017 at 0.875%
Debt Instrument [Line Items]
Long-term debt, gross	250,000,000	250,000,000		250,000,000	250,000,000
Notes due 2021 at 2.75%
Debt Instrument [Line Items]
Long-term debt, gross	$ 250,000,000	$ 250,000,000		$ 250,000,000	$ 250,000,000