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Quarterly Results (Unaudited) (Tables)
12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information
Current and Historical Quarterly Results of the Company
 Three months ended
 March 31,June 30,September 30,December 31,
 20202019202020192020201920202019
Revenues$4,956 $4,940 $5,068 $5,092 $5,171 $5,347 $5,328 $5,361 
Benefits, losses and expenses4,612 4,165 4,476 4,636 4,639 4,694 4,676 4,685 
Net income$273 $630 $468 $372 $459 $535 $537 $548 
Less: Preferred stock dividends— 11 
Net income available to common stockholders$268 $625 $463 $372 $453 $524 $532 $543 
Net income available to common stockholders per common share
Basic$0.75 $1.74 $1.29 $1.03 $1.26 $1.45 $1.48 $1.51 
Diluted$0.74 $1.71 $1.29 $1.02 $1.26 $1.43 $1.47 $1.49