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Investing Activities (Tables)
 9 Months Ended
Sep. 30, 2019
Equity Method Investments and Joint Ventures [Abstract]  
Realized Gain (Loss) on Investments [Table Text Block]
The following table presents certain items reflected in Other investing income (loss) – net in the Consolidated Statement of Income:
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2019
 
2018
 
2019
 
2018
 
(Millions)
Impairment of equity-method investments (Note 13)
$
(114
)
 
$
—

 
$
(186
)
 
$
—

Gain (loss) on deconsolidation of businesses
—

 
—

 
(2
)
 
62

Gain on disposition of equity-method investments
—

 
—

 
122

 
—

Other
7

 
2

 
12

 
12

Other investing income (loss) – net
$
(107
)
 
$
2

 
$
(54
)
 
$
74