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Restricted cash (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Restricted Cash [Line Items]
Restricted cash	$ 402	$ 482
Long-term restricted cash (related to CIRR deposits and loan facility)	218	250
Short-term restricted cash	184	232
CIRR Deposits [Member]
Restricted Cash [Line Items]
Restricted cash	270	298
Margin Calls Related to Share Forward Agreements [Member]
Restricted Cash [Line Items]
Restricted cash	69	137
Restricted Deposit Related to Loan Facility [Member]
Restricted Cash [Line Items]
Restricted cash	5	5
Tax Withholding Deposits [Member]
Restricted Cash [Line Items]
Restricted cash	$ 58	$ 42

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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