KBR Separation (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended		3 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Mar. 31, 2013 Indemnification Agreement [Member]
Loss Contingencies [Line Items]
KBR indemnities and guarantees	$ 0		$ 219
Payment related to KBR separation	$ 219	$ 0		$ 219

The payments made in the period which reduced loss contingency liabilities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_LossContingencyAccrualCarryingValuePayments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration