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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
(In millions)
 
2017

 
2016

 
2015

 
 
 
 
 
 
 
Cash Paid For:
 
 
 
 
 
 
Interest
 
$
533

 
$
458

 
$
438

 
 
 
 
 
 
 
Income Taxes
 
$
479

 
$
663

 
$
477

 
 
 
 
 
 
 
Non-cash Activities
 
 
 
 
 
 
Declared but unpaid dividends
 
$
61

 
$
60

 
$
61

 
 
 
 
 
 
 
Issuance of stock upon vesting of restricted stock units
 
$
125

 
$
127

 
$
131

 
 
 
 
 
 
 
Fair value of investments contributed to defined benefit plans
 
$
—

 
$
16

 
$
—
Restrictions on Cash and Cash Equivalents [Table Text Block]
Cash, cash equivalents and restricted cash is included in the consolidated balance sheet as follows:
 
 
December 31,

 
December 31,

(In millions)
 
2017

 
2016

 
 
 
 
 
Cash and Cash Equivalents
 
$
1,335

 
$
786

Restricted Cash Included in Other Current Assets
 
24

 
18

Restricted Cash Included in Other Assets
 
2

 
7

 
 
 
 
 
Cash, Cash Equivalents and Restricted Cash
 
$
1,361

 
$
811