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SUPPLEMENTARY DATA QUARTERLY FINANCIAL DATA - UNAUDITED (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
($ in millions, except per share data)
2017
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Fiscal
Year
Revenues
$
5,561

 
$
5,795

 
$
5,663

 
$
5,875

 
$
22,894

Operating income
$
537

 
$
620

 
$
632

 
$
570

 
$
2,359

Net income
$
365

 
$
414

 
$
392

 
$
201

(2) 
$
1,372

Basic earnings per share (1)
$
0.95

 
$
1.09

 
$
1.05

 
$
0.55

 
$
3.66

Diluted earnings per share (1)
$
0.94

 
$
1.08

 
$
1.04

 
$
0.54

 
$
3.61

 
($ in millions, except per share data)
2016
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Fiscal
Year
Revenues
$
3,772

 
$
3,902

 
$
3,942

 
$
5,456

 
$
17,072

Operating income
$
367

 
$
389

 
$
171

 
$
441

 
$
1,368

Net income
$
219

 
$
247

 
$
70

 
$
244

 
$
780

Basic earnings per share (1)
$
0.86

 
$
0.97

 
$
0.26

 
$
0.63

 
$
2.68

Diluted earnings per share (1)
$
0.85

 
$
0.96

 
$
0.26

 
$
0.62

 
$
2.64


(1) 
The sum of the earnings per share for the four quarters differs from annual earnings per share due to the required method of computing the weighted average shares in interim periods.
(2) 
Includes our provisional income tax expense estimate of $586 million under the 2017 Tax Act and a gain of $659 million from the disposition of our ownership interest in Avendra.