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QUARTERLY FINANCIAL INFORMATION (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
A summary of our quarterly unaudited results of operations for the years ended December 31, 2017 and 2016 follows:
 
2017
 
First
 
Second
 
Third
 
Fourth
 
(in millions, except per share results)
Total revenues
$
13,762

 
$
13,534

 
$
13,282

 
$
13,189

Income before income taxes
1,689

 
1,042

 
799

 
490

Net income
1,115

 
650

 
499

 
184

Basic earnings per common share (1)
$
7.54

 
$
4.49

 
$
3.46

 
$
1.30

Diluted earnings per common share (1)
$
7.49

 
$
4.46

 
$
3.44

 
$
1.29

 
 
 
 
 
 
 
 
 
2016
 
First
 
Second
 
Third
 
Fourth (2)(3)
 
(in millions, except per share results)
Total revenues
$
13,800

 
$
14,007

 
$
13,694

 
$
12,878

Income (loss) before income taxes
500

 
636

 
902

 
(486
)
Net income (loss)
254

 
311

 
450

 
(401
)
Basic earnings (loss) per common share
$
1.70

 
$
2.08

 
$
3.01

 
$
(2.68
)
Diluted earnings (loss) per common share (1)
$
1.68

 
$
2.06

 
$
2.98

 
$
(2.68
)
(1)
The calculation of earnings per common share is based on the weighted average shares outstanding during each quarter and, accordingly, the sum may not equal the total for the year. For 2017, the sum of quarterly amounts do not equal full year results due to share repurchases throughout the year including two different accelerated share repurchase programs. In addition, for 2016, the sum of quarterly amounts do not equal full year results due to the anti-dilutive impact of a loss in the fourth quarter. The loss position in the fourth quarter required the use of basic weighted-average common shares outstanding in the calculation of diluted loss per share.
(2)
The fourth quarter of 2016 includes an expense of $505 million ($318 million after tax, or $2.11 per diluted common share) for reserve strengthening associated with our closed block of long-term care insurance policies.
(3)
Total revenue for 2016 includes a reduction of $583 million ($367 million after-tax, or $2.43 per diluted common share) in premiums associated with the write-off of risk corridor receivables.