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Leases Operating Lease Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |
Lessee, Operating Lease, Liability, to be Paid, Year One | $ 45 |
Lessee, Operating Lease, Liability, to be Paid, Year Two | 42 |
Lessee, Operating Lease, Liability, to be Paid, Year Three | 34 |
Lessee, Operating Lease, Liability, to be Paid, Year Four | 28 |
Lessee, Operating Lease, Liability, to be Paid, Year Five | 26 |
Lessee, Operating Lease, Liability, to be Paid, after Year Five | 191 |
Total Minimum Lease Payments | 366 | $ 394
Public Service Electric and Gas Company |  |
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |
Lessee, Operating Lease, Liability, to be Paid, Year One | 16 |
Lessee, Operating Lease, Liability, to be Paid, Year Two | 13 |
Lessee, Operating Lease, Liability, to be Paid, Year Three | 11 |
Lessee, Operating Lease, Liability, to be Paid, Year Four | 10 |
Lessee, Operating Lease, Liability, to be Paid, Year Five | 8 |
Lessee, Operating Lease, Liability, to be Paid, after Year Five | 69 |
Total Minimum Lease Payments | 127 | 126
PSEG Power LLC |  |
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |
Lessee, Operating Lease, Liability, to be Paid, Year One | 14 |
Lessee, Operating Lease, Liability, to be Paid, Year Two | 14 |
Lessee, Operating Lease, Liability, to be Paid, Year Three | 8 |
Lessee, Operating Lease, Liability, to be Paid, Year Four | 3 |
Lessee, Operating Lease, Liability, to be Paid, Year Five | 3 |
Lessee, Operating Lease, Liability, to be Paid, after Year Five | 47 |
Total Minimum Lease Payments | 89 | 100
Other |  |
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |
Lessee, Operating Lease, Liability, to be Paid, Year One | 15 |
Lessee, Operating Lease, Liability, to be Paid, Year Two | 15 |
Lessee, Operating Lease, Liability, to be Paid, Year Three | 15 |
Lessee, Operating Lease, Liability, to be Paid, Year Four | 15 |
Lessee, Operating Lease, Liability, to be Paid, Year Five | 15 |
Lessee, Operating Lease, Liability, to be Paid, after Year Five | 75 |
Total Minimum Lease Payments | $ 150 | $ 168

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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease due after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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