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Employee Retirement Benefits - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Target asset allocations [Abstract] |  |  |
Defined contribution expense | $ 64 | $ 58 | $ 54
Pension Benefits [Member] |  |  |
Weighted-average assumptions used to determine benefit obligations [Abstract] |  |  |
Discount rate (in hundredths) | 2.53% | 3.22% |
Salary increase (in hundredths) | 4.40% | 4.40% |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate | 3.82% | 3.83% |
Pension Benefits [Member] | Equity Securities [Member] |  |  |
Target asset allocations [Abstract] |  |  |
Equity investments, target allocation percentage (in hundredths) | 45.00% |  |
Pension Benefits [Member] | Debt Securities [Member] |  |  |
Target asset allocations [Abstract] |  |  |
Equity investments, target allocation percentage (in hundredths) | 32.00% |  |
Pension Benefits [Member] | Alternative Investments [Member] |  |  |
Target asset allocations [Abstract] |  |  |
Equity investments, target allocation percentage (in hundredths) | 13.00% |  |
Pension Benefits [Member] | Convertible Securities [Member] |  |  |
Target asset allocations [Abstract] |  |  |
Equity investments, target allocation percentage (in hundredths) | 10.00% |  |
FPL[Member] |  |  |
Target asset allocations [Abstract] |  |  |
Defined contribution expense | $ 37 | $ 36 | $ 34

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted-average interest crediting rate used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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