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Equity - Performance shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based compensation |  |  |  |  |
Share-based payments subject to redemption |  | $ 37 | $ 36 | $ 30 | $ 24
Performance Shares | Long Term Incentive Plan |  |  |  |  |
Share-based compensation |  |  |  |  |
Performance shares calculation period (in years) |  | 3 years |  |  |
Vesting terms |  | 3 years |  |  |
Granted (in shares) |  | 27 | 38 | 44 |
Weighted-average fair value per share, Granted (in dollars per share) |  | $ 141.91 | $ 114.08 | $ 131.34 |
Cancelled (in shares) |  | 16 |  |  |
Unrecognized compensation cost |  | $ 3 |  |  |
Remaining requisite service period (in years) |  | 1 year 8 months 12 days |  |  |
Share-based payments subject to redemption |  | $ 10 | $ 11 |  |
Performance Shares | Long Term Incentive Plan | Minimum |  |  |  |  |
Share-based compensation |  |  |  |  |
Performance shares available for vesting (as a percent) |  | 0.00% |  |  |
Performance Shares | Long Term Incentive Plan | Maximum |  |  |  |  |
Share-based compensation |  |  |  |  |
Performance shares available for vesting (as a percent) |  | 200.00% |  |  |
Performance Shares Award Granted In 2015 | Long Term Incentive Plan |  |  |  |  |
Share-based compensation |  |  |  |  |
Award pay out achieved (as a percent) | 200.00% |  |  |  |
Vested (in shares) | 92 |  |  |  |
Performance Shares Award Granted in 2018 |  |  |  |  |
Share-based compensation |  |  |  |  |
Estimated pay out (as a percent) |  | 0.00% |  |  |
Performance Shares Award Granted in 2017 |  |  |  |  |
Share-based compensation |  |  |  |  |
Estimated pay out (as a percent) |  | 0.00% |  |  |
Performance Shares Award Granted in 2016 |  |  |  |  |
Share-based compensation |  |  |  |  |
Estimated pay out (as a percent) |  | 0.00% |  |  |

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- Definition The length of time used to calculation the final payments for performance shares. + References No definition available. + Details
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- Definition Estimated pay out percentage of share-based compensation award as of balance sheet date. + References No definition available. + Details
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- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, 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 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Carrying amount, attributable to parent and noncontrolling interests, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + 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 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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