Shareholders' Equity and Stock Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2011

Shareholders Equity And Stock Incentive Plans [Abstract]

Summary of common stock and other shareholders' equity activity

	Company Shareholders' Equity
			Paid-in
			Capital in									Accumulated			Noncontrolling
			Excess									Other			Interest in
	Common		of Par			Treasury			Retained			Comprehensive			Consolidated
Millions of dollars	Shares		Value			Stock			Earnings			Income (Loss)			Subsidiaries		Total
Balance at December 31, 2008	$	2,666	$	484		$	(5,251	)	$	10,041		$	(215	)	$	19	$	7,744
Cash dividends paid		-		-			-			(324	)		-			-		(324	)
Stock plans		3		(51	)		266			-			-			-		218
Common shares purchased		-		-			(17	)		-			-			-		(17	)
Tax loss from exercise of options and
restricted stock		-		(22	)		-			-			-			-		(22	)
Other		-		-			-			1			-			-		1
Total dividends and other transactions with
shareholders		3		(73	)		249			(323	)		-			-		(144	)
Comprehensive income (loss):
Net income		-		-			-			1,145			-			10		1,155
Other comprehensive income (loss):
Cumulative translation adjustment		-		-			-			-			(5	)		-		(5	)
Defined benefit and other postretirement
plans, net		-		-			-			-			2			-		2
Net unrealized gains on investments, net of
tax provision of $3		-		-			-			-			5			-		5
Total comprehensive income		-		-			-			1,145			2			10		1,157
Balance at December 31, 2009	$	2,669	$	411		$	(5,002	)	$	10,863		$	(213	)	$	29	$	8,757
Cash dividends paid		-		-			-			(327	)		-			-		(327	)
Stock plans		5		(37	)		252			-			-			-		220
Common shares purchased		-		-			(141	)		-			-			-		(141	)
Tax loss from exercise of
options and restricted stock		-		(18	)		-			-			-			-		(18	)
Other		-		-			-			-			-			(21)		(21	)
Total dividends and other transactions
with shareholders		5		(55	)		111			(327	)		-			(21)		(287	)
Treasury shares issued for acquisition		-		(17	)		120			-			-			-		103
Comprehensive income (loss):
Net income		-		-			-			1,835			-			7		1,842
Other comprehensive income (loss):
Cumulative translation adjustment		-		-			-			-			(1	)		-		(1	)
Defined benefit and other postretirement
plans adjustments, net		-		-			-			-			(26	)		(1)		(27	)
Total comprehensive income		-		-			-			1,835			(27	)		6		1,814
Balance at December 31, 2010	$	2,674	$	339		$	(4,771	)	$	12,371		$	(240	)	$	14	$	10,387
Cash dividends paid		-		-			-			(330	)		-			-		(330	)
Stock plans		9		82			267			-			-			-		358
Common shares purchased		-		-			(43	)		-			-			-		(43	)
Tax loss from exercise of
options and restricted stock		-		34			-			-			-			-		34
Total dividends and other transactions
with shareholders		9		116			224			(330	)		-			-		19
Comprehensive income (loss):
Net income		-		-			-			2,839			-			5		2,844
Other comprehensive income (loss):
Defined benefit and other postretirement
plans adjustments, net		-		-			-			-			(33	)		(1)		(34	)
Total comprehensive income		-		-			-			2,839			(33	)		4		2,810
Balance at December 31, 2011	$	2,683	$	455		$	(4,547	)	$	14,880		$	(273	)	$	18	$	13,216

Schedule of accumulated other comprehensive (loss)

Accumulated other comprehensive loss	December 31
Millions of dollars	2011			2010			2009
Cumulative translation adjustment	$	(66	)	$	(66	)	$	(65	)
Defined benefit and other postretirement liability adjustments (a)		(208	)		(175	)		(149	)
Unrealized gains on investments		1			1			1
Total accumulated other comprehensive loss	$	(273	)	$	(240	)	$	(213	)

 (a)Included net actuarial losses for our international pension plans of $184 million at December 31, 2011, $170 million at December 31, 2010, and $149 million at December 31, 2009.

Schedule of shares of common stock

Shares of common stock	December 31
Millions of shares	2011			2010			2009
Issued		1,073			1,069			1,067
In treasury		(152	)		(159	)		(165	)
Total shares of common stock outstanding		921			910			902

Stock-based compensation costs

	Year Ended December 31
Millions of dollars	2011			2010			2009
Stock-based compensation cost	$	198		$	158		$	143
Tax benefit	$	(61	)	$	(50	)	$	(46	)
Stock-based compensation cost, net of tax	$	137		$	108		$	97

Stock options activity

			Weighted		Weighted
			Average		Average		Aggregate
	Number		Exercise		Remaining		Intrinsic
	of Shares		Price		Contractual		Value
Stock Options	(in millions)		per Share		Term (years)		(in millions)
Outstanding at January 1, 2011		15.8	$	26.79
Granted		3.4		43.87
Exercised		(3.9)		22.05
Forfeited/expired		(0.4)		33.54
Outstanding at December 31, 2011		14.9	$	31.74		6.7	$	94
Exercisable at December 31, 2011		8.5	$	29.07		5.3	$	68

Assumptions and fair values of options granted

Year Ended December 31
	2011		2010		2009
Expected term (in years)		5.20		5.27		5.18
Expected volatility		40%		40%		53%
Expected dividend yield		0.69 - 1.01%		0.99 - 1.71%		1.23 - 2.55%
Risk-free interest rate		0.93 - 2.29%		1.20 - 2.78%		1.38 - 2.47%
Weighted average grant-date fair value per share	$	15.61	$	9.94	$	9.36

	Offering period July 1 through December 31
	2011			2010			2009
Expected term (in years)		0.5			0.5			0.5
Expected volatility		34	%		43	%		80	%
Expected dividend yield		0.70	%		1.44	%		1.74	%
Risk-free interest rate		0.10	%		0.21	%		0.33	%
Weighted average grant-date fair value per share	$	12.57		$	6.72		$	7.66

	Offering period January 1 through June 30
	2011			2010			2009
Expected term (in years)		0.5			0.5			0.5
Expected volatility		43	%		48	%		71	%
Expected dividend yield		0.88	%		1.15	%		1.85	%
Risk-free interest rate		0.20	%		0.19	%		0.27	%
Weighted average grant-date fair value per share	$	10.99		$	8.81		$	6.69

Restricted stock awards activity

			Weighted Average
	Number of Shares		Grant-Date Fair
Restricted Stock	(in millions)		Value per Share
Nonvested shares at January 1, 2011		13.3	$	28.10
Granted		5.4		43.35
Vested		(3.7)		28.81
Forfeited		(0.8)		32.59
Nonvested shares at December 31, 2011		14.2	$	33.45