Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Period Type:	duration

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Share Repurchase Program (Details) - USD ($) shares in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Aug. 09, 2018	Sep. 06, 2016
Class of Stock [Line Items]
Stock repurchase program, authorized amount				$ 150,000,000.0
Stock repurchase program, additional authorized repurchase amount			$ 1,000,000,000.0
Stock repurchase program, remaining authorized repurchase amount	$ 743,000,000.0	$ 743,000,000.0
Class A Common Stock
Class of Stock [Line Items]
Treasury stock, shares acquired (in shares)	0.5	4.0
Treasury stock, value acquired	$ 20,000,000.0	$ 125,000,000.0