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QUARTERLY FINANCIAL DATA (UNAUDITED)

12 Months Ended

Dec. 31, 2011

QUARTERLY FINANCIAL DATA (UNAUDITED)

13. QUARTERLY FINANCIAL DATA (UNAUDITED)

	First Quarter		Second Quarter		Third Quarter		Fourth Quarter		Annual
2011 Millions of dollars, except per share amounts
Total operating revenues	$	1,281	$	1,000	$	1,092	$	1,036	$	4,409
Operating income	248		142		215		208		813
Income available to common shareholders	128		56		105		98		387
Basic earnings per share	1.00		.44		.81		.76		3.01
Diluted earnings per share	1.00		.43		.81		.75		2.97

2010 Millions of dollars, except per share amounts
Total operating revenues	$	1,428	$	939	$	1,088	$	1,146	$	4,601
Operating income	230		137		196		205		768
Income available to common shareholders	127		54		101		94		376
Basic earnings per share	1.02		.43		.80		.74		2.99
Diluted earnings per share	1.02		.43		.79		.74		2.98

- Definition

The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished.

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