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Debt and Equity Transactions (Unaudited) Interest, Dividends and Maturities (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Capitalized Interest [Line Items]
Interest costs incurred	$ 224	$ 75
Interest costs capitalized	63	18
Dividends Payable, Date Declared	Mar. 26, 2014
Authorized Quarterly Rate Of Common Stock Dividend	$ 0.3125
Dividends Payable, Date to be Paid	May 01, 2014
Dividends Payable, Date of Record	Apr. 15, 2014
Property, Plant, Equipment and Mining Development Costs, Net [Member]
Capitalized Interest [Line Items]
Interest costs capitalized	40
Oil and Gas Properties Not Subject to Amortization [Member]
Capitalized Interest [Line Items]
Interest costs capitalized	$ 23

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Authorized Quarterly Rate Of Common Stock Dividend

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Date the declared dividend will be paid, in CCYY-MM-DD format.

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-Glossary Allowance for Funds Used during Construction

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Total interest costs incurred during the period and either capitalized or charged against earnings.

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