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Equity-Indexed Compensation Plans - Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Consolidated Equity-Indexed Compensation Plan Information
Equity-indexed compensation expense	$ 34	$ 79	$ 41
LTIP unit-settled vestings	47	21	16
LTIP cash-settled vestings	31	$ 22	$ 25
Equity-Indexed Compensation Plan Fair Value Amortization
2020	22
2021	13
2022	7
2023	4
2024	2
Thereafter	4
Total	$ 52

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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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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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