Long-term debt (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Maturities of Long-term Debt
2014	$ 1,371
2015	1,204
2016	1,884
2017 and after	22,340
Long Term debt, noncurrent	$ 26,799	$ 21,538

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Amount of long-term debt maturing in year five and thereafter following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed determinable prices and dates.

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- Definition

Amount of long-term debt maturing within the fourth full year following the date of the most recent balance sheet presented in the financial statements.

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No definition available.

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- Definition

Amount of long-term debt maturing within the third full year following the date of the most recent balance sheet presented in the financial statements.

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No definition available.

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- Definition

Amount of long-term debt maturing within the second full year following the date of the most recent balance sheet presented in the financial statements.

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- Definition

Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date, including any accrued charges.

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