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Quarterly Results (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2023
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
First QuarterSecond QuarterThird QuarterFourth Quarter
($ in millions, except per share data)20232022202320222023202220232022
Revenues$13,786 $12,336 $13,979 $12,219 $14,497 $13,208 $14,832 $13,648 
Net income (loss) applicable to common shareholders
(346)634 (1,389)(1,040)(41)(685)1,460 (303)
Earnings per common share applicable to common shareholders - Basic
(1.31)2.28 (5.29)(3.80)(0.16)(2.55)5.57 (1.15)
Earnings per common share applicable to common shareholders - Diluted (1)
(1.31)2.25 (5.29)(3.80)(0.16)(2.55)5.52 (1.15)
(1)For periods presented with a net loss from continuing operations applicable to common shareholders, weighted average shares for basic earnings per share is also used for calculating diluted earnings per share because all dilutive potential common shares are anti-dilutive and are therefore excluded from the calculation.
Impact of adoption for reserve for future policy benefits
First Quarter
Second Quarter
Third Quarter
Fourth Quarter
($ in millions, except per share data)2022202220222022
Revenues
$(1)$(1)$— $1 
Net income (loss) applicable to common shareholders
4 2 9 7 
Earnings per common share applicable to common shareholders - Basic
0.01 0.01 0.03 0.02 
Earnings per common share applicable to common shareholders - Diluted
0.01 0.01 0.03 0.02