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Borrowings (Details) € in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) borrowing | Mar. 31, 2021 USD ($) | Jun. 30, 2020 USD ($) | May 30, 2020 USD ($) | Apr. 30, 2020 | Aug. 31, 2019 USD ($) | Feb. 28, 2018 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) instrument | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2021 EUR (€) | Feb. 28, 2021 USD ($) | Aug. 31, 2020 USD ($) | Apr. 14, 2020 USD ($) | Feb. 27, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 700,000,000 |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 | $ 1,500,000,000 | $ 700,000,000
Stated interest percentage |  | 1.20% |  | 2.55% |  |  |  |  |  |  |  |  |  |  |  | 3.75% |  | 3.75%
Redemption price, percentage |  | 101.00% |  | 101.00% |  |  | 101.00% |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of notes |  | $ 692,000,000 |  | $ 296,000,000 |  |  | $ 119,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  |  |  | 364 days |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of term loan |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 | $ 1,000,000,000 | $ 1,100,000,000 |  |  |  |  |
Proceeds from revolving credit facility |  |  |  |  |  |  |  |  |  |  | $ 0 | 800,000,000 |  |  |  |  |  |
Debt covenant, acquisition for consideration, minimum threshold | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt covenant, total indebtedness to total capitalization ratio, maximum when acquisition for consideration threshold is met, percentage | 0.65 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, total indebtedness to total capitalization, percentage |  |  |  |  |  |  |  |  |  |  | 0.49 |  |  |  |  |  |  |
Long-term commercial paper |  |  |  |  |  |  |  | $ 625,000,000 |  |  | $ 625,000,000 |  | 250,000,000 |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  | $ 6,780,000,000 |  |  | 6,780,000,000 |  | 5,334,000,000 |  |  |  |  |
Repayments of Debt |  |  |  |  |  |  |  |  | $ 170,000,000 |  | $ 173,000,000 | 503,000,000 |  |  |  |  |  |
Debt Instrument, Number Of Debt Instruments Matured | instrument |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Debt covenant, total indebtedness to total capitalization ratio, maximum |  |  |  |  |  |  |  | 0.60 |  |  | 0.60 |  |  |  |  |  |  |
Debt extinguishment charge |  |  |  |  |  |  |  | $ 0 |  | $ 0 | $ 0 | $ (7,000,000) |  |  |  |  |  |
Term Loan Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000,000 |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000,000 |  |  |
Proceeds from revolving credit facility | $ 700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maximum Number Of Additional Borrowings | borrowing | 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non - Callable Debentures 9 Percent Due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest percentage | 9.00% |  |  |  |  |  |  |  | 9.00% |  |  |  |  | 9.00% |  |  |  |
Long-term Debt | $ 134,000,000 |  |  |  |  |  |  |  | $ 134,000,000 |  |  |  |  |  |  |  |  |
Other Non US Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt | € |  |  |  |  |  |  |  |  |  |  |  |  |  | € 30 |  |  |  |
Notes Payable, Other Payables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest percentage |  |  | 3.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early redemption of notes |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt extinguishment charge |  |  | 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized fees and discounts related to the debt redeemed |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt, before Write off of Debt Issuance Cost |  |  | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility outstanding |  |  |  |  |  | $ 2,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, additional borrowing capacity available to lender conditions |  |  |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from revolving credit facility |  |  |  |  |  |  |  | 800,000,000 |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  | $ 0 |  |  | $ 0 |  | $ 0 |  |  |  |  |

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