Commitments - Operating Leases (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Leased Assets [Line Items]
Operating leases, future minimum payments due	$ 3,690,000,000
Total rent expense, net of sublease income	119,000,000	136,000,000	143,000,000
Contingent rent expense	17,000,000	18,000,000	21,000,000
Drilling Rigs [Member]
Operating Leased Assets [Line Items]
Operating leases, future minimum payments due	3,300,000,000
Exploration and Production and Other Operating Lease Agreements [Member]
Operating Leased Assets [Line Items]
Operating leases, future minimum payments due	388,000,000
Residual value guarantees	53,000,000
Operating lease, residual value guarantees accrued	0
Exploration and Production and Other Operating Lease Agreements [Member] | Maximum [Member]
Operating Leased Assets [Line Items]
Operating leases, expiration date	Dec. 31, 2026
Offshore Drilling Rig Commitments [Member]
Operating Leased Assets [Line Items]
Operating leases, future minimum payments due	3,100,000,000
Number of drilling vessels related to operating leases	8
Onshore Drilling Rig Commitments [Member]
Operating Leased Assets [Line Items]
Operating leases, future minimum payments due	155,000,000
Spar Platform and Production Vessel Leases [Member]
Operating Leased Assets [Line Items]
Operating leases, future minimum payments due	$ 206,000,000