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QUARTERLY RESULTS (UNAUDITED) (Tables)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
 
2019(1)
($ in millions, except per share data)
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Fiscal
Year
Revenues
$
1,060

 
$
1,068

 
$
1,082

 
$
1,145

 
$
4,355

Expenses
$
(969
)
 
$
(925
)
 
$
(1,012
)
 
$
(991
)
 
$
(3,897
)
Net income (loss) attributable to common shareholders
$
24

 
$
49

 
$
(9
)
 
$
74

 
$
138

Earnings (loss) per share attributable to common shareholders
 
 
 
 
 
 
 
 
 
Basic
$
0.52

 
$
1.11

 
$
(0.21
)
 
$
1.74

 
$
3.13

Diluted
$
0.51

 
$
1.10

 
$
(0.21
)
 
$
1.71

 
$
3.09

 
2018(1)
($ in millions, except per share data)
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Fiscal
Year
Revenues
$
571

 
$
595

 
$
750

 
$
1,052

 
$
2,968

Expenses
$
(518
)
 
$
(546
)
 
$
(698
)
 
$
(939
)
 
$
(2,701
)
Net income (loss) attributable to common shareholders
$
36

 
$
11

 
$
(36
)
 
$
44

 
$
55

Earnings (loss) per share attributable to common shareholders
 
 
 
 
 
 
 
 
 
Basic
$
1.35

 
$
0.40

 
$
(1.08
)
 
$
0.92

 
$
1.64

Diluted
$
1.32

 
$
0.39

 
$
(1.08
)
 
$
0.91

 
$
1.61

_______________________
(1) 
The sum of the earnings per share attributable to common shareholders for the four quarters differs from annual earnings per share attributable to common shareholders due to the required method of computing the weighted average shares in interim periods.