Debt Instrument, Maximum Borrowing Capacity

No definition available.

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- Definition

Long-term Debt, Reserved for Future Issuance

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Total Long Term Debt, Tax Exempt Bonds

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

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Period Type:	duration

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

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- Details

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- Details

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- Details

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Tax-Exempt Bonds (Details) - USD ($) $ in Millions	12 Months Ended
Tax-Exempt Bonds (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total Long Term Debt, Tax Exempt Bonds	$ 539	$ 488
Long-term Debt	2,383	2,342
Long-term Debt, Current Maturities	17	15
Loss on extinguishment of debt	0	(15)	$ (84)
Tax-Exempt Bonds [Member]
Debt Instrument [Line Items]
Long-term Debt	544	494
Debt Issuance Costs, Net	3
Loss on extinguishment of debt	3
Tax-Exempt Bonds [Member] \| Pennsylvania Tax Exempt Bonds [Member]
Debt Instrument [Line Items]
Total Long Term Debt, Tax Exempt Bonds	50
Long-term Debt	$ 50	0
Stated interest rate (percent)	3.25%
Tax-Exempt Bonds [Member] \| New Hampshire Series 2018A Bonds [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 20	20
Stated interest rate (percent)	4.00%
Tax-Exempt Bonds [Member] \| New Hampshire Series 2018B Bonds [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 67	67
Stated interest rate (percent)	4.625%
Tax-Exempt Bonds [Member] \| New Hampshire Series 2018B Bonds [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 170
Tax-Exempt Bonds [Member] \| New Hampshire Series 2018C Bonds [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 82	82
Stated interest rate (percent)	4.875%
Tax-Exempt Bonds [Member] \| New York Series 2018A [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 130	130
Stated interest rate (percent)	4.75%
Tax-Exempt Bonds [Member] \| New York Series 2018B [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 35	35
Stated interest rate (percent)	3.50%
Tax-Exempt Bonds [Member] \| Series 2018 Virginia Bonds [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 30	30
Stated interest rate (percent)	5.00%
Debt Instrument, Maximum Borrowing Capacity	$ 50
Long-term Debt, Reserved for Future Issuance	20
Tax-Exempt Bonds [Member] \| Pennsylvania Series 2015A [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 40	40
Stated interest rate (percent)	5.00%
Tax-Exempt Bonds [Member] \| New Jersey Series 2015A [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 90	$ 90
Stated interest rate (percent)	5.25%
Tax-Exempt Bonds [Member] \| New York 2018 Series Total [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 165