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Stock Repurchase Programs (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Summary of stock repurchase activity
The stock repurchase activity under our stock repurchase programs during the year ended December 31, 2017 is summarized as follows:
 
Shares Repurchased
 
Average Price
Paid per Share(1)
 
Value of Shares Repurchased
 
Remaining Amount Authorized
 
(In millions, except per share amounts)
Balance as of January 2017
 
 
 
 
 
 
$
1,005

Repurchases of shares of common stock for three months ended:
 
 
 
 
 
 
 
March 31, 2017
12.2

 
$
42.38

 
$
517

 
$
488

New Authorization in April 2017 of $5 billion
—

 
$
—

 
$
—

 
$
5,488

June 30, 2017
1.8

 
$
49.41

 
$
89

 
$
5,399

September 30, 2017
1.7

 
$
59.49

 
$
100

 
$
5,299

December 31, 2017
4.0

 
$
74.30

 
$
300

 
$
4,999

Balance as of December 31, 2017
19.7

 
 
 
$
1,006

 
$
4,999

(1) Average price paid per share includes broker commissions.