Other Liabilities, Short-Term (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Accounts Payable and Other Current Liabiliities [Line Items]
Accrued Royalties, Current	$ 1,408	$ 1,337
Accrued Drilling And Production Costs	459	525
Prepayments Received	564	749
Employee-related Liabilities, Current	187	224
Dividends Payable, Current	101	101
Other Accrued Liabilities, Current	830	805
Other Liabilities, Current	$ 3,549	$ 3,741

Carrying value as of the balance sheet date of obligations incurred through that date and payable for royalties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.

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