Guarantee of Securities of Subsidiaries Income Statement (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Total Revenues	$ 3,577	$ 3,017	$ 7,229	$ 5,678
Cost of Sales	1,602	1,248	3,240	2,205
Depreciation, depletion and amortization	406	357	807	685
Other operating expenses	3	(24)	(3)	(24)
Total Operating Costs, Expenses and Other	2,722	2,416	5,441	4,293
Operating (Loss) Income	855	601	1,788	1,385
Other Income (Expense), Net	(162)	435	(325)	546
Income from Continuing Operations Before Income Taxes	693	1,036	1,463	1,931
Income Tax Expense	(24)	(26)	(40)	(127)
Income from Continuing Operations	669	1,010	1,423	1,804
Loss from Discontinued Operations	0	0	0	(2)
Net Income	669	1,010	1,423	1,802
Net Income Attributable to Noncontrolling Interests	(8)	(10)	(16)	(19)
Net Income (Loss) Attributable to KMEP	661	1,000	1,407	1,783
Total Other Comprehensive (Loss)	(25)	(4)	(144)	(94)
Comprehensive Income	644	1,006	1,279	1,708
Comprehensive Income Attributable to Noncontrolling Interests	(8)	(10)	(15)	(18)
Comprehensive Income Attributable to KMEP	636	996	1,264	1,690
Parent Company [Member]
Total Revenues	0	0	0	0
Cost of Sales	0	0	0	0
Depreciation, depletion and amortization	0	0	0	0
Other operating expenses	0	0	0	0
Total Operating Costs, Expenses and Other	0	0	0	0
Operating (Loss) Income	0	0	0	0
Other Income (Expense), Net	663	1,004	1,412	1,789
Income from Continuing Operations Before Income Taxes	663	1,004	1,412	1,789
Income Tax Expense	(2)	(4)	(5)	(6)
Income from Continuing Operations				1,783
Loss from Discontinued Operations				0
Net Income	661	1,000	1,407	1,783
Net Income Attributable to Noncontrolling Interests	0	0	0	0
Net Income (Loss) Attributable to KMEP	661	1,000	1,407	1,783
Total Other Comprehensive (Loss)	(25)	(4)	(143)	(93)
Comprehensive Income	636	996	1,264	1,690
Comprehensive Income Attributable to Noncontrolling Interests	0	0	0	0
Comprehensive Income Attributable to KMEP	636	996	1,264	1,690
Subsidiary Issuer [Member]
Total Revenues	0	0	0	0
Cost of Sales	0	0	0	0
Depreciation, depletion and amortization	0	2	0	2
Other operating expenses	8	26	15	26
Total Operating Costs, Expenses and Other	8	28	15	28
Operating (Loss) Income	(8)	(28)	(15)	(28)
Other Income (Expense), Net	45	35	78	35
Income from Continuing Operations Before Income Taxes	37	7	63	7
Income Tax Expense	0	0	0	0
Income from Continuing Operations				7
Loss from Discontinued Operations				0
Net Income	37	7	63	7
Net Income Attributable to Noncontrolling Interests	0	0	0	0
Net Income (Loss) Attributable to KMEP	37	7	63	7
Total Other Comprehensive (Loss)	0	0	0	0
Comprehensive Income	37	7	63	7
Comprehensive Income Attributable to Noncontrolling Interests	0	0	0	0
Comprehensive Income Attributable to KMEP	37	7	63	7
Non-Guarantor Subsidiaries [Member]
Total Revenues	3,577	3,017	7,229	5,678
Cost of Sales	1,602	1,248	3,240	2,205
Depreciation, depletion and amortization	406	355	807	683
Other operating expenses	706	785	1,379	1,377
Total Operating Costs, Expenses and Other	2,714	2,388	5,426	4,265
Operating (Loss) Income	863	629	1,803	1,413
Other Income (Expense), Net	(160)	435	(323)	537
Income from Continuing Operations Before Income Taxes	703	1,064	1,480	1,950
Income Tax Expense	(22)	(22)	(35)	(121)
Income from Continuing Operations				1,829
Loss from Discontinued Operations				(2)
Net Income	681	1,042	1,445	1,827
Net Income Attributable to Noncontrolling Interests	(8)	(10)	(16)	(19)
Net Income (Loss) Attributable to KMEP	673	1,032	1,429	1,808
Total Other Comprehensive (Loss)	(25)	(4)	(144)	(94)
Comprehensive Income	656	1,038	1,301	1,733
Comprehensive Income Attributable to Noncontrolling Interests	8	(10)	(15)	18
Comprehensive Income Attributable to KMEP	648	1,028	1,286	1,715
Consolidation, Eliminations [Member]
Total Revenues	0	0	0	0
Cost of Sales	0	0	0	0
Depreciation, depletion and amortization	0	0	0	0
Other operating expenses	0	0	0	0
Total Operating Costs, Expenses and Other	0	0	0	0
Operating (Loss) Income	0	0	0	0
Other Income (Expense), Net	(710)	(1,039)	(1,492)	(1,815)
Income from Continuing Operations Before Income Taxes	(710)	(1,039)	(1,492)	(1,815)
Income Tax Expense	0	0	0	0
Income from Continuing Operations				(1,815)
Loss from Discontinued Operations				0
Net Income	(710)	(1,039)	(1,492)	(1,815)
Net Income Attributable to Noncontrolling Interests	0	0	0	0
Net Income (Loss) Attributable to KMEP	(710)	(1,039)	(1,492)	(1,815)
Total Other Comprehensive (Loss)	25	4	143	93
Comprehensive Income	(685)	(1,035)	(1,349)	(1,722)
Comprehensive Income Attributable to Noncontrolling Interests	0	0	0	0
Comprehensive Income Attributable to KMEP	(685)	(1,035)	(1,349)	(1,722)
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]
Total Revenues	3,577	3,017	7,229	5,678
Cost of Sales	1,602	1,248	3,240	2,205
Depreciation, depletion and amortization	406	357	807	685
Other operating expenses	714	811	1,394	1,403
Total Operating Costs, Expenses and Other	2,722	2,416	5,441	4,293
Operating (Loss) Income	855	601	1,788	1,385
Other Income (Expense), Net	(162)	435	(325)	546
Income from Continuing Operations Before Income Taxes	693	1,036	1,463	1,931
Income Tax Expense	(24)	(26)	(40)	(127)
Income from Continuing Operations				1,804
Loss from Discontinued Operations				(2)
Net Income	669	1,010	1,423	1,802
Net Income Attributable to Noncontrolling Interests	(8)	(10)	(16)	(19)
Net Income (Loss) Attributable to KMEP	661	1,000	1,407	1,783
Total Other Comprehensive (Loss)	(25)	(4)	(144)	(94)
Comprehensive Income	644	1,006	1,279	1,708
Comprehensive Income Attributable to Noncontrolling Interests	8	(10)	(15)	18
Comprehensive Income Attributable to KMEP	$ 636	$ 996	$ 1,264	$ 1,690