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Equity-Indexed Compensation Plans - Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Consolidated Equity-Indexed Compensation Plan Information
Equity-indexed compensation expense	$ 41	$ 60	$ 27
LTIP unit-settled vestings	16	24	37
LTIP cash-settled vestings	25	$ 28	$ 66
Equity-Indexed Compensation Plan Fair Value Amortization
2018	42
2019	21
2020	9
2021	2
2022	1
Total	$ 75

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- References

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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.

+ References

No definition available.

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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.

+ References

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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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No definition available.

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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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No definition available.

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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.

+ References

No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
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-Subparagraph (SAB Topic 14.F)
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Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB
-Name Accounting Standards Codification
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