Stock repurchase program effective date.

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Expiration date for the purchase of an entity's own shares under a stock repurchase plan, in the CCYY-MM-DD format.

+ References

No definition available.

+ Details

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- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

+ Details

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Period Type:	duration

- Definition

Number of previously issued common shares repurchased by the issuing entity and held in treasury.

+ 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 210.5-02.30)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Amount allocated to previously issued common shares repurchased by the issuing entity and held in treasury.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.30)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Balance Type:	debit
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- Details

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- Details

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Equity - Narrative (Details) - USD ($)		12 Months Ended
Equity - Narrative (Details) - USD ($)	May 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Feb. 13, 2019	Aug. 01, 2018	Nov. 30, 2017
Equity Class Of Treasury Stock [Line Items]
Purchase of common stock value under the share repurchase program		$ 1,072,000,000	$ 750,000,000
Common Stock [Member] \| 2017 Share Repurchase Program [Member]
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, authorized amount	$ 500,000,000
Stock repurchase program effective date		Nov. 30, 2017
Average share price	$ 49.58
Purchase of common stock under the share repurchase program	10,085,647
Common Stock [Member] \| 2017 Share Repurchase Program [Member] \| Maximum [Member]
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, authorized amount						$ 500,000,000
Common Stock [Member] \| 2018 Share Repurchase Program [Member]
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, authorized amount				$ 1,000,000,000
Stock repurchase program effective date		Aug. 01, 2018
Average share price		$ 36.24	$ 39.31
Purchase of common stock under the share repurchase program		8,895,142	6,350,857
Stock repurchase program expiration date		Dec. 31, 2020
Purchase of common stock value under the share repurchase program		$ 322,000,000	$ 250,000,000
Remaining available amount of common stock under the share repurchase program		$ 428,000,000
Common Stock [Member] \| 2018 Share Repurchase Program [Member] \| Maximum [Member]
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, authorized amount					$ 750,000,000