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SUPPLEMENTARY DATA - QUARTERLY FINANCIAL DATA – UNAUDITED (Tables)
 12 Months Ended
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
($ in millions, except per share data)
2014
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Fiscal
Year
Revenues
$
3,293

 
$
3,484

 
$
3,460

 
$
3,559

 
$
13,796

Operating income
$
254

 
$
316

 
$
298

 
$
291

 
$
1,159

Net income
$
172

 
$
192

 
$
192

 
$
197

 
$
753

Diluted earnings per share
$
0.57

 
$
0.64

 
$
0.65

 
$
0.68

 
$
2.54

 

($ in millions, except per share data)
2013 (2)
 
First
Quarter (1)
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Fiscal
Year
Revenues
$
3,142

 
$
3,263

 
$
3,160

 
$
3,219

 
$
12,784

Operating income
$
226

 
$
279

 
$
245

 
$
238

 
$
988

Net income
$
136

 
$
179

 
$
160

 
$
151

 
$
626

Diluted earnings per share
$
0.43

 
$
0.57

 
$
0.52

 
$
0.49

 
$
2.00

 
(1) 
Beginning in 2013, we changed our financial reporting cycle to a calendar year-end reporting cycle and an end-of-month quarterly reporting cycle. Accordingly, our 2013 first quarter included the period from December 29, 2012 through March 31, 2013.
(2) 
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.