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Equity Items - Additional Information (Details) - USD ($)	3 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Apr. 30, 2015
Accelerated Share Repurchases [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.25	$ 0.225	$ 0.225	$ 0.225	$ 0.225	$ 0.39	$ 0.39
2015 Stock Repurchase Program [Member]
Accelerated Share Repurchases [Line Items]
Stock Repurchase Program, Authorized Amount								$ 1,000,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount				$ 500,000,000
2018 Stock Repurchase Program [Member]
Accelerated Share Repurchases [Line Items]
Stock Repurchase Program, Authorized Amount		$ 1,000,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 1,000,000,000

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+ References

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- Definition

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

+ References

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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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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