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Stockholders' Equity - Components of Share-based Compensation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax Charges	$ 57	$ 39	$ 27
Net-of-Tax Amount	53	37	26
RSAs, PSAs and PSUs (defined below)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax Charges	47	29	17
Net-of-Tax Amount	44	28	17
Employee stock purchase plan and stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax Charges	10	10	10
Net-of-Tax Amount	$ 9	$ 9	$ 9

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Amount, after tax, of expense for award under share-based payment arrangement.

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