Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

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, 2020, 2019 and 2018:

	December 31
	2020		2019		2018
Balance at beginning of period	$	196	$	138	$	42
Net income attributable to redeemable noncontrolling interests	22		27		29
Other comprehensive (loss) income	3		(10)		(2)
Acquisition and other	—		17		96
Noncontrolling interest tender offer redemption	(46)		—		—
Redemption value remeasurement adjustments	10		58		—
Purchase accounting measurement period adjustments	—		(8)		—
Reclassification of noncontrolling interest to permanent equity	(82)		—		—
Contributions received	—		—		6
Dividends declared to noncontrolling interests	(25)		(26)		(33)
Balance at end of period	$	78	$	196	$	138