Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Federal
Current		$ 63	$ (80)	$ (193)
Deferred		(46)	(30)	(217)
Total		17	(110)	(410)
State and local
Current		44	(23)	24
Deferred		1	47	82
Total		45	24	106
Foreign
Current		3,290	4,844	3,088
Deferred		(15)	(241)	(58)
Total		3,275	4,603	3,030
Current Income Tax Expense (Benefit)		3,397	4,741	2,919
Deferred Income Tax Expense (Benefit)		(60)	(224)	(193)
Income Tax Expense (Benefit)		3,337	4,517	2,726
Effective Tax Rate Reconciliation [Abstract]
Statutory rate applied to income from continuing operations before income taxes		35.00%	35.00%	35.00%
Effects of foreign operations, including foreign tax credits		14.00%	18.00%	6.00%
Change in permanent reinvestment assertion		0.00%	0.00%	5.00%
Adjustments to valuation allowances		18.00%	21.00%	14.00%
Tax law changes		0.00%	0.00%	1.00%
Other		1.00%	0.00%	0.00%
Effective income tax rate on continuing operations		68.00%	74.00%	61.00%
Tax Adjustments, Settlements, and Unusual Provisions	716
Foreign Undistributed Earnings	2,046
United States Tax Credit On Foreign Tax	488
Valuation Allowance Deferred Tax Asset Change In Amount Foreign	(228)
United Kingdom Supplemental Oil And Gas Tax Rate Previous				20.00%
United Kingdom Supplemental Oil And Gas Tax Rate Effective March 2011				32.00%
Other Foreign Tax Expense Benefit				10
Other State Tax Expense Benefit	32
Deferred tax assets:
Employee benefits		387	510
Operating loss carryforwards		284	368
Foreign tax credits		5,730	4,351
Other		98	121
Valuation allowances:
Federal		(2,997)	(2,067)
State, net of federal benefit		(67)	(60)
Foreign		(149)	(210)
Total deferred tax assets		3,286	3,013
Deferred tax liabilities:
Property, plant and equipment		4,018	3,691
Investments in subsidiaries and affiliates		794	840
Other		67	12
Total deferred tax liabilities		4,879	4,543
Deferred Tax Liabilities, Net		$ 1,593	$ 1,530