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Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2018
Accounting Policies [Abstract]  
Calculation of Diluted Shares
The following table shows the calculation of diluted shares (in millions):
  
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2017
 
2018
 
2017
 
2018
Shares used in computation of basic earnings per share
481

 
488

 
479

 
486

Total dilutive effect of outstanding stock awards
13

 
13

 
13

 
14

Shares used in computation of diluted earnings per share
494

 
501

 
492

 
500
Schedule of New Accounting Pronouncements and Changes in Accounting Principles
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 September 30, 2017
Previously Reported
 
Adjustments
 
As Revised
Operating activities
$
3,851

 
$
(74
)
 
$
3,777

Investing activities
(19,120
)
 
642

 
(18,478
)
Financing activities
14,685

 
(23
)
 
14,662

Net change in cash, cash equivalents, and restricted cash
$
(584
)
 
$
545

 
$
(39
)
Nine Months Ended September 30, 2017
Previously Reported
 
Adjustments
 
As Revised
Operating activities
$
6,090

 
$
(83
)
 
$
6,007

Investing activities
(25,787
)
 
684

 
(25,103
)
Financing activities
12,507

 
(8
)
 
12,499

Net change in cash, cash equivalents, and restricted cash
$
(7,190
)
 
$
593

 
$
(6,597
)
Twelve Months Ended September 30, 2017
Previously Reported
 
Adjustments
 
As Revised
Operating activities
$
17,077

 
$
(81
)
 
$
16,996

Investing activities
(29,961
)
 
792

 
(29,169
)
Financing activities
11,916

 
14

 
11,930

Net change in cash, cash equivalents, and restricted cash
$
(968
)
 
$
725

 
$
(243
)