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Income Tax Expense - Additional Information (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 10, 2018 | Jun. 28, 2018 | Jan. 01, 2021 | Jan. 01, 2021 | Sep. 30, 2020 | May 04, 2020
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Net of tax adjustments |  |  | $ 8 | $ 8 |  |
Net tax deficiencies |  |  | 12 | 12 |  |
Additional tax expense from re-measurement of deferred tax liabilities |  |  | 10 | 10 |  |
Unrecognized tax benefits |  |  | 715 | 715 |  |
Penalties and interest accrued on unrecognized tax benefits |  |  | 146 | 146 |  |
Potential payables related to unrecognized tax benefits |  |  | $ 724 | $ 724 |  |
Internal Revenue Service (IRS) | Tax Year 2008 Through 2009 |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Federal tax, subject to interest |  | $ 516 |  |  |  |
Internal Revenue Service (IRS) | Tax Years 2010 Through 2012 |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Federal tax, subject to interest | $ 549 |  |  |  |  |
Federal tax related to adjustments for transfer pricing | $ 535 |  |  |  |  |
Penalties asserted |  |  |  |  |  | $ 340
Internal Revenue Service (IRS) | Tax Years 2013 Through 2015 |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Additional tax |  |  |  |  | $ 343 |

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