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Earnings per share (Tables)
 9 Months Ended
Sep. 30, 2019
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,
 
2019
 
2018
 
2019
 
2018
Income (Numerator):
 
 
 
 
 
 
 
Net income for basic and diluted EPS
$
1,968

 
$
1,859

 
$
6,139

 
$
6,466

 
 
 
 
 
 
 
 
Shares (Denominator):
 
 
 
 
 
 
 
Weighted-average shares for basic EPS
599

 
645

 
609

 
669

Effect of dilutive securities
3

 
4

 
4

 
4

Weighted-average shares for diluted EPS
602

 
649

 
613

 
673

 
 
 
 
 
 
 
 
Basic EPS
$
3.29

 
$
2.88

 
$
10.08

 
$
9.67

Diluted EPS
$
3.27

 
$
2.86

 
$
10.01

 
$
9.61