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Earnings per share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Computation for basic and diluted earnings per share
The computations for basic and diluted EPS were as follows (in millions, except per-share data):
 
Three months ended
September 30,
 
Nine months ended
September 30,
 
2018
 
2017
 
2018
 
2017
Income (Numerator):
 
 
 
 
 
 
 
Net income for basic and diluted EPS
$
1,859

 
$
2,021

 
$
6,466

 
$
6,243

 
 
 
 
 
 
 
 
Shares (Denominator):
 
 
 
 
 
 
 
Weighted-average shares for basic EPS
645

 
728

 
669

 
733

Effect of dilutive securities
4

 
5

 
4

 
5

Weighted-average shares for diluted EPS
649

 
733

 
673

 
738

 
 
 
 
 
 
 
 
Basic EPS
$
2.88

 
$
2.78

 
$
9.67

 
$
8.52

Diluted EPS
$
2.86

 
$
2.76

 
$
9.61

 
$
8.46