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Summary of Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Schedule of Redeemable Noncontrolling Interests
The following is a rollforward of the activity in the redeemable noncontrolling interests for the years ended December 31, 2019, 2018 and 2017:
 
December 31
 
2019
 
2018
 
2017
Balance at beginning of period
$
138

 
$
42

 
$
40

Net income attributable to redeemable noncontrolling interests
27

 
29

 
36

Other comprehensive (loss) income
(10
)
 
(2
)
 
3

Acquisition and other
17

 
96

 
—

Purchase accounting measurement period adjustments
(8
)
 
—

 
—

Contributions received
—

 
6

 
—

Redemption value remeasurement adjustments
58

 
—

 
—

Distributions to noncontrolling interests
(26
)
 
(33
)
 
(37
)
Balance at end of period
$
196

 
$
138

 
$
42