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Stockholders' Equity - Narrative (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Feb. 07, 2019
Equity [Abstract]
Stock repurchased during period (in shares)	2.6
Stock repurchased during period	$ 341
Additional amount authorized under repurchase program		$ 1,000
Amount remaining under repurchase program	$ 338

X

- Definition

Stock Repurchase Program, Additional Amount Authorized to be Repurchased

+ References

No definition available.

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- Definition

Amount remaining of a stock repurchase plan authorized.

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X

- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
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-Topic 505
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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
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-Name Accounting Standards Codification
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