Information Relating to the Consolidated Statement of Cash Flows (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011 Atlas Energy Inc [Member]	Dec. 31, 2012 International [Member] Upstream [Member]
Additional Information Relating to the Consolidated Statement of Cash Flows (Textual) [Abstract]
Reduction for income tax benefits associated with stock options exercised	$ 79	$ 98	$ 121
Cash paid for all common shares of acquired company	0	0	3,009
Cash advance to acquired company	0	0	403
Repayments of long-term debt and other financing obligations related to acquisition				761
Repayments of lines of credit				271
Payment to cash out Atlas equity awards				184
Share repurchase price	5,004	5,004	4,262
Stock repurchased during period, shares	41.6	46.6	42.3
Stock repurchased during period, value	5,000	5,000	4,250
Proceeds from issuance of tax exempt bonds			374
Proceeds to be received in future periods for the sale of an equity interest		800
Proceeds received for sale of an equity interest	82
Increase in Properties, plant and equipment related to asset exchange in Australia					1,850
Noncash additions to properties, plant and equipment	$ 1,661	$ 4,569	$ 945