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Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2022
Summary Of Significant Accounting Policies [Abstract]  
Net Income (Loss) Per Common Share
Years Ended December 31,
(Amounts in millions, except per share amounts)
2022
2021
2020
Net income (loss) per share:
Numerator
Net income (loss)
$
597
$
1,379
$
514
Less:
 
dividends declared-common shares and nonvested common shares
(255)
(247)
(249)
Undistributed earnings
342
1,132
265
Percentage allocated to common shareholders (1)
98.7
%
98.7
%
98.7
%
337
1,117
262
Add:
 
dividends declared-common shareholders
252
244
246
Numerator for basic and diluted earnings per common share
$
589
$
1,361
$
508
Denominator
Denominator for basic earnings per weighted-average common shares
39
39
40
Effect of dilutive securities:
Options
-
-
-
Denominator for diluted earnings per adjusted weighted-average common shares
39
39
40
Per common share net income (loss)
Basic
$
15.19
$
34.66
$
12.81
Diluted
$
15.19
$
34.62
$
12.78
(1)
Basic weighted-average common shares outstanding
39
39
40
Basic weighted-average common shares outstanding
 
and nonvested common shares expected
 
to vest
 
39
40
40
Percentage allocated to common shareholders
 
98.7
%
98.7
%
98.7
%
(Some amounts may not reconcile due to rounding.)