Gain on Contract Settlements/Extinguishments, net - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2009
Additional Expenditures by Other Contractual Commitments [Line Items]
Net gain recognized on contract settlements/ extinguishments, net line	$ 28
FDR Holdings, Ltd. [Member]
Additional Expenditures by Other Contractual Commitments [Line Items]
Net gain recognized on contract settlements/ extinguishments, net line		45
Settlement amount allocated to discontinued operations		14
Noble David Tinsley [Member]
Additional Expenditures by Other Contractual Commitments [Line Items]
Net gain recognized on contract settlements/ extinguishments, net line			5
Incident charge				$ 17