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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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Estimated pay out percentage of share-based compensation award as of balance sheet date.

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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.

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Unrecognized cost of unvested share-based compensation awards.

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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.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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).

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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).

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Percentage of vesting of share-based compensation awards.

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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.

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