Goodwill (Details) (USD $) In Millions	9 Months Ended
Sep. 30, 2011
Schedule of Goodwill
Balance at January 1, 2011	$ 13,952
Adjustments relating to Smith acquisition	194
Other acquisitions	47
Divestiture of business	(51)
Impact of changes in exchange rates	(24)
Balance at September 30, 2011	14,118
Reservoir Characterization [Member]
Schedule of Goodwill
Balance at January 1, 2011	3,381
Adjustments relating to Smith acquisition	0
Other acquisitions	0
Divestiture of business	(51)
Impact of changes in exchange rates	(10)
Balance at September 30, 2011	3,320
Reservoir Production [Member]
Schedule of Goodwill
Balance at January 1, 2011	2,351
Adjustments relating to Smith acquisition	13
Other acquisitions	0
Divestiture of business	0
Impact of changes in exchange rates	(8)
Balance at September 30, 2011	2,356
Drilling [Member]
Schedule of Goodwill
Balance at January 1, 2011	8,150
Adjustments relating to Smith acquisition	175
Other acquisitions	47
Divestiture of business	0
Impact of changes in exchange rates	(6)
Balance at September 30, 2011	8,366
Distribution [Member]
Schedule of Goodwill
Balance at January 1, 2011	70
Adjustments relating to Smith acquisition	6
Other acquisitions	0
Divestiture of business	0
Impact of changes in exchange rates	0
Balance at September 30, 2011	$ 76

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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+ Details

- Definition

The increase (decrease) in the recorded value of goodwill for foreign currency translation adjustments and purchase accounting adjustments needed to revise the carrying amount of goodwill to fair value.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Publisher FASB

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+ Details