Quarterly Results (unaudited) (Tables)

12 Months Ended

Dec. 31, 2024

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

	First quarter				Second quarter				Third quarter				Fourth quarter
($ in millions, except per share data)	2024		2023		2024		2023		2024		2023		2024		2023
Revenues	$	15,259	$	13,786	$	15,714	$	13,979	$	16,627	$	14,497	$	16,506	$	14,832
Net income (loss) applicable to common shareholders	1,189		(346)		301		(1,389)		1,161		(41)		1,899		1,460
Net income (loss) applicable to common shareholders per common share - Basic	4.51		(1.31)		1.14		(5.29)		4.39		(0.16)		7.16		5.57
Net income (loss) applicable to common shareholders per common share - Diluted (1)	4.46		(1.31)		1.13		(5.29)		4.33		(0.16)		7.07		5.52

(1)For periods presented with a net loss from continuing operations applicable to common shareholders, weighted average shares for basic earnings per share is also used for calculating diluted earnings per share because all dilutive potential common shares are anti-dilutive and are therefore excluded from the calculation.