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Equity-Indexed Compensation Plans - Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Consolidated Equity-Indexed Compensation Plan Information
Equity-indexed compensation expense	$ 79	$ 41	$ 60
LTIP unit-settled vestings	21	16	24
LTIP cash-settled vestings	22	$ 25	$ 28
Equity-Indexed Compensation Plan Fair Value Amortization
2019	30
2020	14
2021	4
2022	0
2023	0
Total	48
Maximum
Equity-Indexed Compensation Plan Fair Value Amortization
2022	1
2023	$ 1

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The amount of amortization expense expected to be recognized during the fifth twelve-month period following the balance sheet date for the amortization of the unrecognized expense based on fair value of outstanding awards related to equity compensation plans.

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The amount of amortization expense expected to be recognized during the fourth twelve-month period following the balance sheet date for the amortization of the unrecognized expense based on fair value of outstanding awards related to equity compensation plans.

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The amount of amortization expense expected to be recognized during the twelve-month period following the balance sheet date for the amortization of the unrecognized expense based on fair value of outstanding awards related to equity compensation plans.

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The amount of amortization expense expected to be recognized during the third twelve-month period following the balance sheet date for the amortization of the unrecognized expense based on fair value of outstanding awards related to equity compensation plans.

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The amount of amortization expense expected to be recognized during the second twelve-month period following the balance sheet date for the amortization of the unrecognized expense based on fair value of outstanding awards related to equity compensation plans.

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Other Consolidated Equity Compensation Information [Abstract]

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Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Vested In Period, Total Settlement Fair Value

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Share Based Compensation Arrangement By Share Based Payment Award, Vested In Period, Cash Settled

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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