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Defined Benefits (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Jun. 30, 2017 | Mar. 31, 2017 | Mar. 31, 2016
Pension Benefits United States [Member] |  |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |  |
Service cost |  | $ 17 | $ 17
Interest cost |  | 42 | 43
Expected return on plan assets |  | (57) | (56)
Amortization of: [Abstract] |  |  |
Prior service cost |  | 2 | 1
Actuarial loss |  | 20 | 15
Net periodic defined benefit costs (credits) before special termination benefits |  | 24 | 20
Special termination benefits |  | 2 | 0
Net periodic defined benefit costs (credits) |  | 26 | 20
Pension Benefits United Kingdom [Member] |  |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |  |
Service cost |  | 19 | 18
Interest cost |  | 43 | 62
Expected return on plan assets |  | (125) | (133)
Amortization of: [Abstract] |  |  |
Prior service cost |  | 0 | 0
Actuarial loss |  | 35 | 37
Net periodic defined benefit costs (credits) before special termination benefits |  | (28) | (16)
Special termination benefits |  | 0 | 0
Net periodic defined benefit costs (credits) |  | (28) | (16)
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract] |  |  |
Employer contributions |  | 462 |
Pension Benefits United Kingdom [Member] | Subsequent Event [Member] |  |  |
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract] |  |  |
Employer contributions | $ 23 |  |
Other Postretirement Benefits United States [Member] |  |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |  |
Service cost |  | 2 | 2
Interest cost |  | 6 | 6
Expected return on plan assets |  | (6) | (5)
Amortization of: [Abstract] |  |  |
Net periodic defined benefit costs (credits) |  | 2 | 3
PPL Electric Utilities Corp [Member] | PPL Services [Member] |  |  |
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract] |  |  |
Costs allocated to subsidiary by plan sponsors |  | 8 | 6
LG And E And KU Energy LLC [Member] | Pension Benefits United States [Member] |  |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |  |
Service cost |  | 7 | 6
Interest cost |  | 16 | 17
Expected return on plan assets |  | (22) | (21)
Amortization of: [Abstract] |  |  |
Prior service cost |  | 2 | 1
Actuarial loss |  | 11 | 5
Net periodic defined benefit costs (credits) |  | 14 | 8
LG And E And KU Energy LLC [Member] | Other Postretirement Benefits United States [Member] |  |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |  |
Service cost |  | 1 | 1
Interest cost |  | 2 | 2
Expected return on plan assets |  | (1) | (2)
Amortization of: [Abstract] |  |  |
Prior service cost |  | 0 | 1
Net periodic defined benefit costs (credits) |  | 2 | 2
Louisville Gas And Electric Co [Member] | LKE [Member] |  |  |
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract] |  |  |
Costs allocated to subsidiary by plan sponsors |  | 3 | 2
Louisville Gas And Electric Co [Member] | Pension Benefits United States [Member] |  |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |  |
Interest cost |  | 3 | 3
Expected return on plan assets |  | (5) | (5)
Amortization of: [Abstract] |  |  |
Prior service cost |  | 1 | 1
Actuarial loss |  | 3 | 2
Net periodic defined benefit costs (credits) |  | 2 | 1
Kentucky Utilities Co [Member] | LKE [Member] |  |  |
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract] |  |  |
Costs allocated to subsidiary by plan sponsors |  | $ 4 | $ 3

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- Definition Total amount of net periodic benefit cost for defined benefit plans for the period allocated to subsidiary. + References No definition available. + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period, excluding special termination benefits. + References No definition available. + Details
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- Definition The amount of gains or losses recognized in net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 + Details
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- Definition Amount of contributions made by the employer to defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 35 -Paragraph 123 -Subparagraph B -URI http://asc.fasb.org/extlink&oid=64937487&loc=d3e36068-114959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 63 -Subparagraph B -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12551-114930 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition If applicable, the cost of providing special or contractual termination benefits recognized during the period on the projected benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (q) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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