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Share-Based Payments - Data Related to All Performance Share Awards (PSAs) (Details) - Performance Shares [Member] shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) Employee shares | Dec. 31, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total fair value of shares vested | $ | [1] | $ 4 | $ 58 | $ 9
Total compensation cost related to nonvested awards not yet recognized, pre-tax | $ |  | $ 41 | $ 34 | $ 30
Weighted-average period over which nonvested award cost is expected to be recognized (years) |  | 1 year 9 months 18 days | 1 year 9 months 18 days | 1 year 9 months 18 days
Number of shares modified to accelerate vesting | shares |  |  | 1.1 |
Number of employees affected by plan modification | Employee |  |  | 90 |
Number of shares scheduled for near-term vesting | shares |  |  | 1.1 |
[1] | Includes the 2018 modification of a few PSAs to a few employees, including management employees, in connection with our Organizing for Growth initiative. The terms were modified to permit the vesting upon termination. The impact to compensation expense was immaterial. Includes the 2017 modification for a commitment to pay 1.1 million PSAs to approximately 90 employees, including senior and key management employees, for 1.1 million PSAs. These shares were paid in the first quarter of 2018.

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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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 The number of employees affected by the modification of an equity-based compensation plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of shares for which recognition of compensation cost was accelerated. + References No definition available. + Details
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