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Stock-Based Compensation - Performance Share Plans (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |
Plan Modification, Incremental Compensation Cost | $ 2 | $ 8 | $ 0
Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum | 200.00% |  |
Performance share plan expense | $ 5 | $ 9 | $ 10
Performance share plan, shares issued in period | 0 | 0 | 0
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |
Nonvested shares, number, beginning balance | 297,000 | 355,000 | 410,000
Nonvested shares, weighted average price, beginning balance | $ 60.35 | $ 32.35 | $ 43.99
Nonvested shares, granted | 196,000 | 287,000 | 201,000
Nonvested shares, weighted average price, granted | $ 51.52 | $ 68.38 | $ 45.57
Nonvested shares, vested | (160,000) |  |
Nonvested shares, weighted average price, vested | $ 45.78 |  |
Nonvested shares, forfeited | (93,000) | (345,000) | (256,000)
Nonvested shares, weighted average price, forfeited | $ 55.82 | $ 38.26 | $ 61.40
Nonvested shares, number, ending balance | 240,000 | 297,000 | 355,000
Nonvested shares, weighted average price, ending balance | $ 64.61 | $ 60.35 | $ 32.35
Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | $ 7 |  |
Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 1 year 8 months 12 days |  |
Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |
Nonvested shares, number, beginning balance | 1,516,000 | 1,593,000 | 1,429,000
Nonvested shares, weighted average price, beginning balance | $ 42.97 | $ 38.86 | $ 44.12
Nonvested shares, granted | 1,082,000 | 737,000 | 804,000
Nonvested shares, weighted average price, granted | $ 41.66 | $ 51.70 | $ 40.10
Nonvested shares, vested | (724,000) | (556,000) | (521,000)
Nonvested shares, weighted average price, vested | $ 36.81 | $ 42.25 | $ 56.53
Nonvested shares, forfeited | (210,000) | (258,000) | (119,000)
Nonvested shares, weighted average price, forfeited | $ 44.82 | $ 44.51 | $ 38.97
Nonvested shares, number, ending balance | 1,664,000 | 1,516,000 | 1,593,000
Nonvested shares, weighted average price, ending balance | $ 44.26 | $ 42.97 | $ 38.86
Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | $ 37 |  |
Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 1 year 9 months 18 days |  |
Relative Revenue Growth Performance Share Plans [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum | 200.00% |  |
Performance share plan expense | $ 7 | $ 18 | $ 16
Performance share plan, shares issued in period | 315,000 | 249,000 | 126,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |
Nonvested shares, number, beginning balance | 297,000 | 355,000 | 320,000
Nonvested shares, weighted average price, beginning balance | $ 47.03 | $ 39.42 | $ 38.62
Nonvested shares, granted | 196,000 | 287,000 | 198,000
Nonvested shares, weighted average price, granted | $ 41.90 | $ 50.82 | $ 40.08
Nonvested shares, vested | (160,000) | (166,000) | (156,000)
Nonvested shares, weighted average price, vested | $ 40.10 | $ 38.62 | $ 38.62
Nonvested shares, forfeited | (93,000) | (179,000) | (7,000)
Nonvested shares, weighted average price, forfeited | $ 44.30 | $ 45.82 | $ 39.20
Nonvested shares, number, ending balance | 240,000 | 297,000 | 355,000
Nonvested shares, weighted average price, ending balance | $ 48.52 | $ 47.03 | $ 39.42
Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | $ 8 |  |
Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 1 year 8 months 12 days |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + 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=116856206&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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 (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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