Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Libya Statutory Income Tax Rate	90.00%	90.00%
Effective income tax rate excluding Libya	27.00%	38.00%	37.00%
Federal
Current	$ 15	$ 83	$ (47)
Deferred	62	(47)	43
Total	77	36	(4)
State and local
Current	8	39	(34)
Deferred	(58)	(6)	48
Total	(50)	33	14
Foreign
Current	281	1,374	2,363
Deferred	84	19	(125)
Total	365	1,393	2,238
Current Income Tax Expense (Benefit)	304	1,496	2,282
Deferred Income Tax Expense (Benefit)	88	(34)	(34)
Income Tax Expense (Benefit)	392	1,462	2,248
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	(6.00%)	26.00%	36.00%
Change in permanent reinvestment assertion	(19.00%)	0.00%	0.00%
Adjustments to valuation allowances	21.00%	(1.00%)	0.00%
Other	(2.00%)	1.00%	1.00%
Effective income tax rate on continuing operations	29.00%	61.00%	72.00%
Deferred tax assets:
Employee benefits	364	387
Operating loss carryforwards	245	284
Capital Loss Carryforwards	89	3
Foreign tax credits	4,062	5,730
Other	116	95
Valuation allowances:
Federal	(2,775)	(2,997)
State, net of federal benefit	(58)	(67)
Foreign	(108)	(149)
Total deferred tax assets	1,935	3,286
Deferred tax liabilities:
Property, plant and equipment	3,737	4,018
Investments in subsidiaries and affiliates	66	794
Other	67	67
Total deferred tax liabilities	3,870	4,879
Deferred Tax Liabilities, Net	$ 1,935	$ 1,593