Other Property and Equipment Other Property and Equipment - Assets Held For Sale Table (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Long Lived Assets Held-for-sale [Line Items]
Current assets held for sale	$ 0	$ 4
Property and equipment held for sale, net	730	634
Current liabilities held for sale	0	21
Compressor [Member]
Long Lived Assets Held-for-sale [Line Items]
Property and equipment held for sale, net	285	0
Accounts Receivable [Member]
Long Lived Assets Held-for-sale [Line Items]
Current assets held for sale	0	4
Natural Gas Processing Plant [Member]
Long Lived Assets Held-for-sale [Line Items]
Property and equipment held for sale, net	11	352
Exploration and Production Equipment [Member]
Long Lived Assets Held-for-sale [Line Items]
Property and equipment held for sale, net	29	27
Property, Plant and Equipment, Other Types
Long Lived Assets Held-for-sale [Line Items]
Property and equipment held for sale, net	405	255
Accounts Payable [Member]
Long Lived Assets Held-for-sale [Line Items]
Current liabilities held for sale	0	4
Accrued Liabilities [Member]
Long Lived Assets Held-for-sale [Line Items]
Current liabilities held for sale	$ 0	$ 17