Other Property and Equipment Other Property and Equipment - Assets Held For Sale Table (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Long Lived Assets Held-for-sale [Line Items]
Assets Held for Sale	$ 101	$ 730
Land and Building [Member]
Long Lived Assets Held-for-sale [Line Items]
Assets Held for Sale	101	405
Compressor [Member]
Long Lived Assets Held-for-sale [Line Items]
Assets Held for Sale	0	285
Exploration and Production Equipment [Member]
Long Lived Assets Held-for-sale [Line Items]
Assets Held for Sale	0	29
Natural Gas Processing Plant [Member]
Long Lived Assets Held-for-sale [Line Items]
Assets Held for Sale	$ 0	$ 11