Share-Based Payment and Other Benefits (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	2 Months Ended	10 Months Ended	12 Months Ended
Feb. 28, 2017	Dec. 31, 2017	Dec. 31, 2017
Restricted Stock Units (RSUs)
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period			3 years
Unrecognized compensation cost		$ 156	$ 156
Period over which unrecognized cost will be recognized, in years			1 year 9 months
Long-Term Incentive Plan \| Class A Common Stock
Shares reserve for future issuance		116	116
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			10 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period			4 years
Unrecognized compensation cost		$ 32	$ 32
Period over which unrecognized cost will be recognized, in years			2 years 2 months
Performance-Based Restricted Stock
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period			3 years
Unrecognized compensation cost		$ 13	$ 13
Period over which unrecognized cost will be recognized, in years			1 year 7 months
Vesting period for retirement or disability \| Performance stock units
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period	6 months	7 months
Minimum vesting from date of retirement eligibility \| Performance stock units
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period	6 months	7 months

Aggregate number of common shares reserved for future issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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