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Redeemable Noncontrolling Interests (Tables)
 6 Months Ended
Jun. 30, 2019
Temporary Equity Disclosure [Abstract]  
Redeemable Noncontrolling Interest [Table Text Block]
Reconciliation of changes in redeemable noncontrolling interests —
 
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
 
2019
 
2018
 
2019
 
2018
Balance, beginning of period
 
$
105

 
$
49

 
$
100

 
$
47

Initial fair value of redeemable noncontrolling interests of acquired businesses
 

 
102

 

 
102

Cash contributions from redeemable noncontrolling interests
 
1

 
 
 
2

 
 
Comprehensive income (loss) adjustments:
 

 

 

 

Net income (loss) attributable to redeemable noncontrolling
    interests
 

 

 
(1
)
 
1

Other comprehensive income (loss) attributable to redeemable noncontrolling interests
 
(1
)
 
(2
)
 
4

 
(1
)
Balance, end of period
 
$
105

 
$
149

 
$
105

 
$
149