Acquisitions and Divestitures - Summary of Associated Assets and Liabilities Classified as Held for Sale (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
ASSETS
Current assets	$ 1,628
LNG Projects [Member]
ASSETS
Current assets	30
GTP assets, net of accumulated depreciation	1,497
Other long-term assets	101
Assets held for sale	1,628
LIABILITIES
Current liabilities	12
Other long-term liabilities	7
Liabilities held for sale	19
Canada [Member] \| LNG Projects [Member]
ASSETS
Current assets	30
GTP assets, net of accumulated depreciation	200
Other long-term assets	101
Assets held for sale	331
LIABILITIES
Current liabilities	12
Other long-term liabilities	7
Liabilities held for sale	19
Australia [Member] \| LNG Projects [Member]
ASSETS
GTP assets, net of accumulated depreciation	1,297
Assets held for sale	$ 1,297

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