Aggregate dividends paid during the period for each share of common stock outstanding.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Cash outflow in the form of ordinary dividends to common shareholders, preferred shareholders and noncontrolling interests, generally out of earnings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
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Stockholders' Equity - Summary of Dividends Declared (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Dividends Payable [Line Items]
Payment of dividends to stockholders	$ 186	$ 176	$ 150
February 7, 2018
Dividends Payable [Line Items]
Dividend Per Share	$ 0.3
Payment of dividends to stockholders	$ 46
April 24, 2018
Dividends Payable [Line Items]
Dividend Per Share	$ 0.3
Payment of dividends to stockholders	$ 45
July 23, 2018
Dividends Payable [Line Items]
Dividend Per Share	$ 0.32
Payment of dividends to stockholders	$ 47
October 19, 2018
Dividends Payable [Line Items]
Dividend Per Share	$ 0.32
Payment of dividends to stockholders	$ 48
February 7, 2017
Dividends Payable [Line Items]
Dividend Per Share		$ 0.28
Payment of dividends to stockholders		$ 42
April 26, 2017
Dividends Payable [Line Items]
Dividend Per Share		$ 0.28
Payment of dividends to stockholders		$ 43
July 26, 2017
Dividends Payable [Line Items]
Dividend Per Share		$ 0.3
Payment of dividends to stockholders		$ 45
October 25, 2017
Dividends Payable [Line Items]
Dividend Per Share		$ 0.3
Payment of dividends to stockholders		$ 46
February 8, 2016
Dividends Payable [Line Items]
Dividend Per Share			$ 0.24
Payment of dividends to stockholders			$ 36
April 26, 2016
Dividends Payable [Line Items]
Dividend Per Share			$ 0.24
Payment of dividends to stockholders			$ 36
July 27, 2016
Dividends Payable [Line Items]
Dividend Per Share			$ 0.26
Payment of dividends to stockholders			$ 39
October 24, 2016
Dividends Payable [Line Items]
Dividend Per Share			$ 0.26
Payment of dividends to stockholders			$ 39