Consolidated Statement of Changes in Equity (USD $) In Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Grantor Trusts [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Unearned Employee Compensation [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2009	$ 62,628	$ 17	$ 43,681	$ (16,211)	$ (667)	$ 3,225	$ (76)	$ 32,069	$ 590
Net income	11,417							11,358	59
Other comprehensive income	1,708					1,708
Dividends paid on company common stock	(3,175)							(3,175)
Repurchase of company common stock	(3,866)			(3,866)
Distributions to noncontrolling interests and other	(102)								(102)
Distributed under benefit plans	485		451		34
Recognition of unearned compensation	29						29
Ending Balance at Dec. 31, 2010	69,124	17	44,132	(20,077)	(633)	4,933	(47)	40,252	547
Net income	12,502							12,436	66
Other comprehensive income	(1,687)					(1,687)
Dividends paid on company common stock	(3,632)							(3,632)
Repurchase of company common stock	(11,123)			(11,133)	10
Distributions to noncontrolling interests and other	(103)								(103)
Distributed under benefit plans	639		593	33	13
Recognition of unearned compensation	36						36
Transfer to treasury stock				(610)	610
Other	(7)							(7)
Ending Balance at Dec. 31, 2011	65,749	17	44,725	(31,787)		3,246	(11)	49,049	510
Net income	8,498							8,428	70
Other comprehensive income	627					627
Dividends paid on company common stock	(3,278)							(3,278)
Repurchase of company common stock	(5,098)			(5,098)
Distributions to noncontrolling interests and other	(109)								(109)
Distributed under benefit plans	705	1	599	105
Recognition of unearned compensation	11						11
Separation of Downstream business	(18,697)					214		(18,880)	(31)
Other	19							19
Ending Balance at Dec. 31, 2012	$ 48,427	$ 18	$ 45,324	$ (36,780)		$ 4,087		$ 35,338	$ 440