Project Debt (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Project Debt	$ 125	$ 133
Project Debt Noncurrent	116	125
Client Community Revenue Bonds Collateralized By Property Plant And Equipment	494
Client Community Revenue Bonds Collateralized By Restricted Funds Held In Trust	7
Project Debt Type [Member]
Debt Instrument [Line Items]
2020	2
2021	2
2022	2
2023	2
2024	3
Thereafter	34
Debt Instrument, Unamortized Premium	$ 2	2
Stated interest rate (percent)	5.00%
Equipment Financing [Member]
Debt Instrument [Line Items]
2020	$ 7
2021	7
2022	8
2023	7
2024	5
Thereafter	44
Americas Project Debt Related To Service Fee Structures [Member]
Debt Instrument [Line Items]
Project Debt	$ 45	$ 47
Minimum [Member] \| Americas Project Debt Related To Service Fee Structures [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)	5.00%
Minimum [Member] \| Americas Project Debt Related To Tip Fee Structures [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)	5.00%
Maximum [Member] \| Americas Project Debt Related To Service Fee Structures [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)	5.00%
Maximum [Member] \| Americas Project Debt Related To Tip Fee Structures [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)	5.00%

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Total project debt.

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