Change in Accounting Principle (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Changes and Error Corrections [Abstract]

Schedule of Effects of the Change in Accounting Principle on Consolidated Financial Statements

The following tables summarize the effects of the Change in Accounting Principle on selected line items of our Consolidated Financial Statements:

CONSOLIDATED STATEMENT OF EARNINGS

Year Ended December 31, 2020	As Calculated Under Previous Method		Effect of the Change in Accounting Principle		As Reported
Operating costs and expenses	$	(33,739)	$	(53)	$	(33,792)
Other, net	29		53		82

Year Ended December 31, 2019	As Previously Reported		Effect of the Change in Accounting Principle		As Adjusted
Operating costs and expenses	$	(34,702)	$	(78)	$	(34,780)
Other, net	14		78		92

Year Ended December 31, 2018	As Previously Reported		Effect of the Change in Accounting Principle		As Adjusted
Operating costs and expenses	$	(31,736)	$	(63)	$	(31,799)
Other, net	(16)		63		47

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME

Year Ended December 31, 2020	As Calculated Under Previous Method		Effect of the Change in Accounting Principle		As Reported
Change in retirement plans’ funded status	$	(491)	$	38	$	(453)
Benefit from income tax, net	10		(8)		2
Other comprehensive income, net of tax	238		30		268
Comprehensive income	3,405		30		3,435

Year Ended December 31, 2019	As Previously Reported		Effect of the Change in Accounting Principle		As Adjusted
Change in retirement plans’ funded status	$	(886)	$	29	$	(857)
Benefit from income tax, net	162		(6)		156
Other comprehensive loss, net of tax	(441)		23		(418)
Comprehensive income	3,043		23		3,066

Year Ended December 31, 2018	As Previously Reported		Effect of the Change in Accounting Principle		As Adjusted
Change in retirement plans’ funded status	$	(61)	$	16	$	(45)
Benefit from income tax, net	5		(4)		1
Other comprehensive loss, net of tax	(320)		12		(308)
Comprehensive income	3,025		12		3,037

CONSOLIDATED BALANCE SHEET

December 31, 2020	As Calculated Under Previous Method		Effect of the Change in Accounting Principle		As Reported
Other current assets	$	1,243	$	546	$	1,789
Other liabilities	9,573		115		9,688
Accumulated other comprehensive loss	(3,981)		431		(3,550)

December 31, 2019	As Previously Reported		Effect of the Change in Accounting Principle		As Adjusted
Other current assets	$	1,171	$	508	$	1,679
Other liabilities	9,453		107		9,560
Accumulated other comprehensive loss	(4,219)		401		(3,818)

CONSOLIDATED STATEMENT OF SHAREHOLDERS’ EQUITY

	Retained Earnings		Accumulated Other Comprehensive Loss		Total Shareholders’ Equity
December 31, 2017 – as reported	$	26,444	$	(2,820)	$	11,435
Cumulative-effect of the Change in Accounting Principle as of December 31, 2017	65		301		366
December 31, 2017 – as adjusted	26,509		(2,519)		11,801
Year ended December 31, 2018 – as reported	2,882		(958)		297
Effect of the Change in Accounting Principle*	(65)		77		12
December 31, 2018 – as adjusted	29,326		(3,400)		12,110
Year ended December 31, 2019 – as reported	2,307		(441)		1,845
Effect of the Change in Accounting Principle	—		23		23
December 31, 2019 – as adjusted	31,633		(3,818)		13,978
Year ended December 31, 2020 – under previous method	1,865		238		1,653
Effect of the Change in Accounting Principle	—		30		30
December 31, 2020 – as reported	$	33,498	$	(3,550)	$	15,661

*Includes the impact of our January 1, 2018, adoption of ASU 2018-02, the change in accounting principle which resulted in a reclassification of $65 of stranded tax effects resulting from the implementation of the Tax Cuts and Jobs Act (tax reform) from accumulated other comprehensive loss to retained earnings.

UNAUDITED QUARTERLY CONSOLIDATED STATEMENT OF EARNINGS

	2019								2020
As Calculated Under Previous Method	1Q		2Q		3Q		4Q		1Q		2Q		3Q		4Q
Operating costs and expenses	$	(8,247)	$	(8,465)	$	(8,545)	$	(9,445)	$	(7,808)	$	(8,423)	$	(8,347)	$	(9,161)
Other, net	18		12		(12)		(4)		14		18		12		(15)
Effect of the Change in Accounting Principle
Operating costs and expenses	$	(13)	$	(13)	$	(32)	$	(20)	$	(7)	$	(7)	$	(12)	$	(27)
Other, net	13		13		32		20		7		7		12		27
As Calculated Under New Method
Operating costs and expenses	$	(8,260)	$	(8,478)	$	(8,577)	$	(9,465)	$	(7,815)	$	(8,430)	$	(8,359)	$	(9,188)
Other, net	31		25		20		16		21		25		24		12