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COMMON SHARES - Dividend Reinvestment and Share Purchase Plan (Details)	12 Months Ended
	Dec. 31, 2019
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Discount of shares issued from treasury	2.00%

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- Definition

Stock Issued During Period, Dividend Reinvestment Plan, Shares Issued From Treasury, Discount, Percent

+ References

No definition available.

+ Details

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Namespace Prefix:	trp_
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Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration