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Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Data (Unaudited)
Quarterly Financial Data (Unaudited)
Selected quarterly financial data for the years ended December 31, 2018 and 2017 are as follows (in millions, except per share data):
 
1Q
 
2Q
 
3Q
 
4Q
 
2018
Income Statement Data
 
 
 
 
 
 
 
 
 
Total revenue
$
3,090

 
$
2,561

 
$
2,349

 
$
2,770

 
$
10,770

Operating income
799

 
(16
)
 
262

 
499

 
1,544

Net income from continuing operations
604

 
57

 
155

 
284

 
1,100

Income from discontinued operations, net of tax
6

 
1

 
(2
)
 
69

 
74

Net income
610

 
58

 
153

 
353

 
1,174

Less: Net income attributable to noncontrolling interests
16

 
10

 
6

 
8

 
40

Net income attributable to Aon shareholders
$
594

 
$
48

 
$
147

 
$
345

 
$
1,134

Per Share Data
 
 
 
 
 
 
 
 
 
Basic net income per share attributable to Aon shareholders
 
 
 
 
 
 
 
 
 
Continuing operations
$
2.37

 
$
0.19

 
$
0.61

 
$
1.14

 
$
4.32

Discontinued operations
0.02

 
0.01

 
(0.01
)
 
0.28

 
0.30

Net income
$
2.39

 
$
0.20

 
$
0.60

 
$
1.42

 
$
4.62

Diluted net income per share attributable to Aon shareholders
 
 
 
 
 
 
 
 
 
Continuing operations
$
2.35

 
$
0.19

 
$
0.61

 
$
1.13

 
$
4.29

Discontinued operations
0.02

 
—

 
(0.01
)
 
0.28

 
0.30

Net income
$
2.37

 
$
0.19

 
$
0.60

 
$
1.41

 
$
4.59

 
1Q
 
2Q
 
3Q
 
4Q
 
2017
Income Statement Data
 
 
 
 
 
 
 
 
 
Total revenue
$
2,381

 
$
2,368

 
$
2,340

 
$
2,909

 
$
9,998

Operating income
335

 
(127
)
 
256

 
601

 
1,065

Net income from continuing operations
265

 
(43
)
 
196

 
17

 
435

Income from discontinued operations, net of tax
40

 
821

 
(4
)
 
(29
)
 
828

Net income
305

 
778

 
192

 
(12
)
 
1,263

Less: Net income attributable to noncontrolling interests
14

 
9

 
7

 
7

 
37

Net income attributable to Aon shareholders
$
291

 
$
769

 
$
185

 
$
(19
)
 
$
1,226

Per Share Data
 
 
 
 
 
 
 
 
 
Basic net income per share attributable to Aon shareholders
 
 
 
 
 
 
 
 
 
Continuing operations
$
0.95

 
$
(0.20
)
 
$
0.74

 
$
0.04

 
$
1.54

Discontinued operations
0.15

 
3.13

 
(0.02
)
 
(0.12
)
 
3.20

Net income
$
1.10

 
$
2.93

 
$
0.72

 
$
(0.08
)
 
$
4.74

Diluted net income per share attributable to Aon shareholders
 
 


 
 
 
 
 
 
Continuing operations
$
0.94

 
$
(0.20
)
 
$
0.73

 
$
0.04

 
$
1.53

Discontinued operations
0.15

 
3.13

 
(0.01
)
 
(0.11
)
 
3.17

Net income
$
1.09

 
$
2.93

 
$
0.72

 
$
(0.07
)
 
$
4.70