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Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Reconciliation Between Earnings Per Share

The following table provides a reconciliation between basic and diluted earnings per share for the years ended December 31:

Millions, Except Per Share Amounts	2020		2019		2018
Net income	$	5,349	$	5,919	$	5,966
Weighted-average number of shares outstanding:
Basic		677.3		703.5		750.9
Dilutive effect of stock options		0.8		1.2		1.9
Dilutive effect of retention shares and units		1.0		1.4		1.5
Diluted		679.1		706.1		754.3
Earnings per share – basic	$	7.90	$	8.41	$	7.95
Earnings per share – diluted	$	7.88	$	8.38	$	7.91

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- References

No definition available.

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- Definition

Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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