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Summarized Financial Information of NEECH - Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net cash provided by operating activities | $ 6,413 | $ 6,293 | $ 6,089
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |
Capital expenditures, independent power and other investments and nuclear fuel purchases | (10,740) | (9,636) | (8,377)
Capital contributions from NEE | 0 | 0 | 0
Cash grants under the Recovery Act | (78) | (335) | (8)
Proceeds from sale of the fiber-optic telecommunications business | 1,454 | 0 | 0
Sale of independent power and other investments of NEER | 178 | 658 | 52
Proceeds from sale or maturity of securities in special use funds and other investments | 3,207 | 3,776 | 4,851
Purchases of securities in special use funds and other investments | (3,244) | (3,829) | (4,982)
Proceeds from sales of noncontrolling interests in NEP | 0 | 645 | 345
Other - net | 149 | 5 | 107
Net cash used in investing activities | (8,918) | (8,046) | (7,996)
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |
Issuances of long-term debt | 8,354 | 5,657 | 5,772
Retirements of long-term debt | (6,780) | (3,310) | (3,972)
Proceeds from differential membership investors | 1,414 | 1,859 | 761
Net change in commercial paper | 1,419 | (106) | (768)
Proceeds from other short-term debt | 450 | 500 | 1,225
Repayments of other short-term debt | (2) | (662) | (813)
Issuances of common stock - net | 55 | 537 | 1,298
Proceeds from issuance of NEP convertible preferred units - net | 548 | 0 | 0
Dividends on common stock | (1,845) | (1,612) | (1,385)
Dividends to NEE | 0 | 0 | 0
Other - net | (680) | (363) | (221)
Net cash provided by (used in) financing activities | 2,933 | 2,500 | 1,897
Effects of currency translation on cash, cash equivalents and restricted cash | 26 | 10 | 17
Net increase in cash, cash equivalents and restricted cash | 454 | 757 | 7
Cash, cash equivalents and restricted cash at beginning of year | 1,529 | 772 | 765
Cash, cash equivalents and restricted cash at end of year | 1,983 | 1,529 | 772
Reportable Legal Entities [Member] | NEE (Guarantor) [Member] |  |  |
Net cash provided by operating activities | 1,968 | 1,897 | 1,659
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |
Capital expenditures, independent power and other investments and nuclear fuel purchases | 0 | (1) | 0
Capital contributions from NEE | (92) | (745) | (1,480)
Cash grants under the Recovery Act | 0 | 0 | 0
Proceeds from sale of the fiber-optic telecommunications business | 0 | 0 | 0
Sale of independent power and other investments of NEER | 0 | 0 | 0
Proceeds from sale or maturity of securities in special use funds and other investments | 9 | 0 | 0
Purchases of securities in special use funds and other investments | 0 | 0 | 0
Proceeds from sales of noncontrolling interests in NEP | 0 | 0 | 0
Other - net | 7 | 0 | 0
Net cash used in investing activities | (76) | (746) | (1,480)
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |
Issuances of long-term debt | 0 | 0 | 0
Retirements of long-term debt | 0 | 0 | 0
Proceeds from differential membership investors | 0 | 0 | 0
Net change in commercial paper | 0 | 0 | 0
Proceeds from other short-term debt | 0 | 0 | 0
Repayments of other short-term debt | 0 | 0 | 0
Issuances of common stock - net | 55 | 537 | 1,298
Proceeds from issuance of NEP convertible preferred units - net | 0 | 0 | 0
Dividends on common stock | (1,845) | (1,612) | (1,385)
Dividends to NEE | 0 | 0 | 0
Other - net | (102) | (75) | (92)
Net cash provided by (used in) financing activities | (1,892) | (1,150) | (179)
Effects of currency translation on cash, cash equivalents and restricted cash | 0 | 0 | 0
Net increase in cash, cash equivalents and restricted cash | 0 | 1 | 0
Cash, cash equivalents and restricted cash at beginning of year | 1 | 0 | 0
Cash, cash equivalents and restricted cash at end of year | 1 | 1 | 0
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |
Net cash provided by operating activities | 2,711 | 2,129 | 2,462
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |
Capital expenditures, independent power and other investments and nuclear fuel purchases | (5,449) | (5,701) | (4,744)
Capital contributions from NEE | 0 | 0 | 0
Cash grants under the Recovery Act | (78) | (335) | (8)
Proceeds from sale of the fiber-optic telecommunications business | 1,454 | 0 | 0
Sale of independent power and other investments of NEER | 178 | 658 | 52
Proceeds from sale or maturity of securities in special use funds and other investments | 1,221 | 1,281 | 1,120
Purchases of securities in special use funds and other investments | (1,163) | (1,323) | (1,190)
Proceeds from sales of noncontrolling interests in NEP | 0 | 645 | 345
Other - net | 124 | (19) | 79
Net cash used in investing activities | (3,557) | (4,124) | (4,330)
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |
Issuances of long-term debt | 6,393 | 5,349 | 4,689
Retirements of long-term debt | (5,907) | (3,048) | (3,421)
Proceeds from differential membership investors | 1,414 | 1,859 | 761
Net change in commercial paper | 0 | (318) | 318
Proceeds from other short-term debt | 0 | 0 | 1,125
Repayments of other short-term debt | 0 | (212) | (813)
Issuances of common stock - net | 0 | 0 | 0
Proceeds from issuance of NEP convertible preferred units - net | 548 | 0 | 0
Dividends on common stock | 0 | 0 | 0
Dividends to NEE | (633) | (650) | (698)
Other - net | (563) | (292) | (150)
Net cash provided by (used in) financing activities | 1,252 | 2,688 | 1,811
Effects of currency translation on cash, cash equivalents and restricted cash | 26 | 10 | 17
Net increase in cash, cash equivalents and restricted cash | 432 | 703 | (40)
Cash, cash equivalents and restricted cash at beginning of year | 1,375 | 672 | 712
Cash, cash equivalents and restricted cash at end of year | 1,807 | 1,375 | 672
Consolidation, Eliminations [Member] |  |  |
Net cash provided by operating activities | 1,734 | 2,267 | 1,968
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |
Capital expenditures, independent power and other investments and nuclear fuel purchases | (5,291) | (3,934) | (3,633)
Capital contributions from NEE | 92 | 745 | 1,480
Cash grants under the Recovery Act | 0 | 0 | 0
Proceeds from sale of the fiber-optic telecommunications business | 0 | 0 | 0
Sale of independent power and other investments of NEER | 0 | 0 | 0
Proceeds from sale or maturity of securities in special use funds and other investments | 1,977 | 2,495 | 3,731
Purchases of securities in special use funds and other investments | (2,081) | (2,506) | (3,792)
Proceeds from sales of noncontrolling interests in NEP | 0 | 0 | 0
Other - net | 18 | 24 | 28
Net cash used in investing activities | (5,285) | (3,176) | (2,186)
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |
Issuances of long-term debt | 1,961 | 308 | 1,083
Retirements of long-term debt | (873) | (262) | (551)
Proceeds from differential membership investors | 0 | 0 | 0
Net change in commercial paper | 1,419 | 212 | (1,086)
Proceeds from other short-term debt | 450 | 500 | 100
Repayments of other short-term debt | (2) | (450) | 0
Issuances of common stock - net | 0 | 0 | 0
Proceeds from issuance of NEP convertible preferred units - net | 0 | 0 | 0
Dividends on common stock | 0 | 0 | 0
Dividends to NEE | 633 | 650 | 698
Other - net | (15) | 4 | 21
Net cash provided by (used in) financing activities | 3,573 | 962 | 265
Effects of currency translation on cash, cash equivalents and restricted cash | 0 | 0 | 0
Net increase in cash, cash equivalents and restricted cash | 22 | 53 | 47
Cash, cash equivalents and restricted cash at beginning of year | 153 | 100 | 53
Cash, cash equivalents and restricted cash at end of year | $ 175 | $ 153 | $ 100

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