Other Property and Equipment Other Property and Equipment - Assets Held For Sale Table (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Long Lived Assets Held-for-sale [Line Items]
Property and equipment held for sale, net	$ 627	$ 730
Compressor [Member]
Long Lived Assets Held-for-sale [Line Items]
Property and equipment held for sale, net	322	285
Natural Gas Processing Plant [Member]
Long Lived Assets Held-for-sale [Line Items]
Property and equipment held for sale, net	10	11
Exploration and Production Equipment [Member]
Long Lived Assets Held-for-sale [Line Items]
Property and equipment held for sale, net	58	29
Property, Plant and Equipment, Other Types
Long Lived Assets Held-for-sale [Line Items]
Property and equipment held for sale, net	$ 237	$ 405