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Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2018
Accounting Policies [Abstract]  
Calculation of Diluted Shares
The following table shows the calculation of diluted shares (in millions):
  
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2017
 
2018
 
2017
 
2018
Shares used in computation of basic earnings per share
479

 
486

 
478

 
485

Total dilutive effect of outstanding stock awards
13

 
14

 
13

 
14

Shares used in computation of diluted earnings per share
492

 
500

 
491

 
499
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
We adopted this ASU in Q1 2018 on a retrospective basis with the following impacts to our consolidated statements of cash flows (in millions):
Three Months Ended June 30, 2017
Previously Reported
 
Adjustments
 
As Revised
Operating activities
$
3,829

 
$
21

 
$
3,850

Investing activities
(5,051
)
 
(223
)
 
(5,274
)
Financing activities
(1,263
)
 
(11
)
 
(1,274
)
Net change in cash, cash equivalents, and restricted cash
$
(2,485
)
 
$
(213
)
 
$
(2,698
)
Six Months Ended June 30, 2017
Previously Reported
 
Adjustments
 
As Revised
Operating activities
$
2,239

 
$
(9
)
 
$
2,230

Investing activities
(6,667
)
 
43

 
(6,624
)
Financing activities
(2,177
)
 
14

 
(2,163
)
Net change in cash, cash equivalents, and restricted cash
$
(6,605
)
 
$
48

 
$
(6,557
)
Twelve Months Ended June 30, 2017
Previously Reported
 
Adjustments
 
As Revised
Operating activities
$
17,885

 
$
(83
)
 
$
17,802

Investing activities
(13,410
)
 
237

 
(13,173
)
Financing activities
(3,769
)
 
38

 
(3,731
)
Net change in cash, cash equivalents, and restricted cash
$
706

 
$
192

 
$
898