Quarterly Supplementary Data (Tables)

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]

Unaudited Quarterly Financial Information

This table includes unaudited quarterly financial information for the years ended December 31, 2020 and 2019:

(Dollars in millions, except per share data)	Quarter
	1st		2nd		3rd		4th		Full year
2020
Revenues	$	(99)	$	2,714	$	2,227	$	2,694	$	7,536
Income (loss) before income taxes	(1,576)		1,145		614		1,316		1,499
Net income (loss)	(1,226)		909		484		1,049		1,216
Net income (loss) per common share—basic	(7.56)		5.65		3.01		6.52		7.55
Net income (loss) per common share—diluted	(7.56)		5.63		2.99		6.47		7.49
2019
Revenues	$	2,159	$	1,913	$	1,700	$	2,152	$	7,924
Income before income taxes	867		530		294		781		2,472
Net income	695		428		248		626		1,997
Net income per common share—basic	4.27		2.62		1.51		3.84		12.24
Net income per common share—diluted	4.22		2.59		1.49		3.79		12.10