Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summarized financial information
Revenue	$ 5,387	$ 5,178	$ 4,741	$ 4,525	$ 4,423	$ 4,078	$ 3,374	$ 2,539	$ 19,831	$ 14,414	$ 9,664
Profit (loss), Total									2,339	1,282	611
Capital Expenditures									2,461	1,491	1,086
Depreciation and amortization									1,321	1,069	711
Assets	24,847				22,986				24,847	22,986	11,439
Consolidated revenue based on location of use of products or services
Total revenue	5,387	5,178	4,741	4,525	4,423	4,078	3,374	2,539	19,831	14,414	9,664
Net property, plant and equipment based on location of assets
Total	7,415				6,310				7,415	6,310	3,161
Industrial Services and Other [Member]
Summarized financial information
Revenue									1,246	971	694
Profit (loss), Total									53	99	70
Capital Expenditures									326	179	196
Depreciation and amortization									56	44	17
Assets	4,294				3,642				4,294	3,642	2,127
Consolidated revenue based on location of use of products or services
Total revenue									1,246	971	694
Total Operations [Member]
Summarized financial information
Revenue									19,831	14,414	9,664
Profit (loss), Total									2,872	1,773	1,048
Capital Expenditures									2,427	1,485	1,084
Depreciation and amortization									1,319	1,066	700
Assets	23,935				21,226				23,935	21,226	9,870
Consolidated revenue based on location of use of products or services
Total revenue									19,831	14,414	9,664
Corporate and Other [Member]
Summarized financial information
Revenue									0
Profit (loss), Total									(533)	(491)	(437)
Capital Expenditures									34	6	2
Depreciation and amortization									2	3	11
Assets	912				1,760				912	1,760	1,569
Consolidated revenue based on location of use of products or services
Total revenue									0
United States [Member]
Net property, plant and equipment based on location of assets
Total	3,752				3,023				3,752	3,023	1,377
Canada and other [Member]
Net property, plant and equipment based on location of assets
Total	529				467				529	467	105
North America [Member]
Summarized financial information
Revenue									10,257	6,621	3,165
Profit (loss), Total									1,929	1,163	201
Capital Expenditures									1,242	589	275
Depreciation and amortization									622	432	255
Assets	9,796				8,187				9,796	8,187	2,596
Consolidated revenue based on location of use of products or services
Total revenue									10,257	6,621	3,165
Net property, plant and equipment based on location of assets
Total	4,281				3,490				4,281	3,490	1,482
Latin America [Member]
Summarized financial information
Revenue									2,183	1,569	1,094
Profit (loss), Total									227	74	78
Capital Expenditures									274	191	182
Depreciation and amortization									201	173	110
Assets	2,727				2,723				2,727	2,723	1,168
Consolidated revenue based on location of use of products or services
Total revenue									2,183	1,569	1,094
Net property, plant and equipment based on location of assets
Total	891				788				891	788	354
Europe / Africa / Russia Caspian [Member]
Summarized financial information
Revenue									3,325	3,006	2,774
Profit (loss), Total									342	260	458
Capital Expenditures									357	318	246
Depreciation and amortization									234	230	175
Assets	3,819				3,544				3,819	3,544	2,248
Consolidated revenue based on location of use of products or services
Total revenue									3,325	3,006	2,774
Net property, plant and equipment based on location of assets
Total	1,325				1,118				1,325	1,118	809
Middle East / Asia Pacific [Member]
Summarized financial information
Revenue									2,820	2,247	1,937
Profit (loss), Total									321	177	241
Capital Expenditures									228	208	185
Depreciation and amortization									206	187	143
Assets	3,299				3,130				3,299	3,130	1,731
Consolidated revenue based on location of use of products or services
Total revenue									2,820	2,247	1,937
Net property, plant and equipment based on location of assets
Total	918				914				918	914	516
Consolidated Revenue by Product or Service [Member] | United States [Member]
Summarized financial information
Revenue									9,131	6,043	3,091
Consolidated revenue based on location of use of products or services
Total revenue									9,131	6,043	3,091
Consolidated Revenue by Product or Service [Member] | Canada and other [Member]
Summarized financial information
Revenue									1,768	1,186	493
Consolidated revenue based on location of use of products or services
Total revenue									1,768	1,186	493
Consolidated Revenue by Product or Service [Member] | North America [Member]
Summarized financial information
Revenue									10,899	7,229	3,584
Consolidated revenue based on location of use of products or services
Total revenue									10,899	7,229	3,584
Consolidated Revenue by Product or Service [Member] | Latin America [Member]
Summarized financial information
Revenue									2,220	1,583	1,134
Consolidated revenue based on location of use of products or services
Total revenue									2,220	1,583	1,134
Consolidated Revenue by Product or Service [Member] | Europe / Africa / Russia Caspian [Member]
Summarized financial information
Revenue									3,671	3,218	2,925
Consolidated revenue based on location of use of products or services
Total revenue									3,671	3,218	2,925
Consolidated Revenue by Product or Service [Member] | Middle East / Asia Pacific [Member]
Summarized financial information
Revenue									3,041	2,384	2,021
Consolidated revenue based on location of use of products or services
Total revenue									$ 3,041	$ 2,384	$ 2,021