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Commitments and Contingencies and Derivative Financial Instruments (Details) $ in Thousands, $ in Millions |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 12, 2022 USD ($) | Apr. 12, 2022 AUD ($) | Jul. 01, 2022 USD ($) | Apr. 01, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jul. 01, 2022 USD ($) | Oct. 01, 2021 USD ($) | Dec. 31, 2012 MW | Dec. 22, 2008 case
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal balance of short-term debt |  |  | $ 51,630 |  |  | $ 51,630 | $ 53,456 |  |
Interest Rate Swap and Cross Currency Interest Rate Contract |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Fair value of derivative assets |  |  | 74,900 |  |  | 74,900 | (800) |  |
Unrealized gain (loss) on derivatives |  |  |  |  | $ 7,400 | 52,800 |  |  |
Interest Rate Swap and Cross Currency Interest Rate Contract | Miscellaneous Other Assets |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Fair value of derivative assets |  |  | 74,900 |  |  | 74,900 | 10,200 |  |
Interest Rate Swap and Cross Currency Interest Rate Contract | Other Deferred Liabilities |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Fair value of derivative assets |  |  |  |  |  |  | (11,000) |  |
Interest Rate Swap |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  | $ 766,700 |  |  | $ 766,700 |  |  |
Interest Rate Swap | SONIA Rate |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Derivative fixed interest rate |  |  | 0.82% |  |  | 0.82% |  |  |
Cross Currency Interest Rate Contract |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  | $ 127,800 |  |  | $ 127,800 |  |  |
Cross Currency Interest Rate Contract | LIBOR |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Spread on variable rate |  |  | 0.875% |  |  | 0.875% |  |  |
Foreign Exchange Forward |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  | $ 186,100 |  |  | $ 186,100 | 506,500 |  |
Fair value of derivative assets |  |  | (3,200) |  |  | $ (3,200) | 55,500 |  |
Settled amount of hedge |  |  | $ 66,700 |  |  |  |  |  |
Minimum | Interest Rate Swap | LIBOR |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Derivative fixed interest rate |  |  | 0.704% |  |  | 0.704% |  |  |
Minimum | Cross Currency Interest Rate Contract |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Term of derivative contract |  |  |  |  |  | 3 years 6 months |  |  |
Derivative fixed interest rate |  |  | 0.726% |  |  | 0.726% |  |  |
Minimum | Foreign Exchange Forward |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Term of derivative contract |  |  |  |  |  | 1 month |  |  |
Maximum | Interest Rate Swap | LIBOR |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Derivative fixed interest rate |  |  | 1.116% |  |  | 1.116% |  |  |
Maximum | Cross Currency Interest Rate Contract |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Term of derivative contract |  |  |  |  |  | 10 years |  |  |
Derivative fixed interest rate |  |  | 0.746% |  |  | 0.746% |  |  |
Maximum | Foreign Exchange Forward |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Term of derivative contract |  |  |  |  |  | 12 months |  |  |
General Electric and GE Electrical International Inc | Settled Litigation |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Plant capacity (in MW's) | MW |  |  |  |  |  |  |  | 360 |
JKC Australia LNG Pty Limited | Settled Litigation |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Settlement payment | $ 475,000 | $ 640 |  |  |  |  |  |  |
Loss related to settlement |  |  |  | $ 91,300 |  | $ 91,300 |  |  |
Kingston Power Plant of the TVA, Secondary Case No. 3:13CV-505-TAV-HBG |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of pending claims | case |  |  |  |  |  |  |  |  | 10
LOCs |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal balance of short-term debt |  |  | $ 286,900 |  |  | 286,900 | 263,800 |  |
Surety Bond |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal balance of short-term debt |  |  | $ 2,200,000 |  |  | $ 2,200,000 | $ 2,100,000 |  |

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