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COVID-19 Pandemic, CARES Funding (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 14 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Apr. 29, 2021
CARES Funds Received [Line Items] |  |  |  |  |  |  |
Total Expected Relief From PSP of CARES Act |  |  |  |  |  | $ 2,270 |
Adjustments to Additional Paid in Capital, Warrant Issued |  |  |  |  |  | 25 |
Total Unsecured Term Loan through PSP of CARES Act |  |  |  |  |  | 600 |
CARES Act Payroll Tax Relief |  |  |  | $ 21 |  |  |
ProceedsFromPayrollSupportProgramGrant |  |  |  |  |  | 1,645 |
PSPGrantRecognized | $ 0 |  | $ 398 | 914 | $ 760 |  |
CARES PSP 1 [Member] |  |  |  |  |  |  |
CARES Funds Received [Line Items] |  |  |  |  |  |  |
Total Expected Relief From PSP of CARES Act |  |  |  |  |  | 1,059 |
Adjustments to Additional Paid in Capital, Warrant Issued |  |  |  |  |  | 9 |
Total Unsecured Term Loan through PSP of CARES Act |  |  |  |  |  | 293 |
ProceedsFromPayrollSupportProgramGrant |  |  |  |  |  | 757 |
PSP Installments Received |  |  |  | 8 |  |  |
CARES PSP 2 [Member] |  |  |  |  |  |  |
CARES Funds Received [Line Items] |  |  |  |  |  |  |
Total Expected Relief From PSP of CARES Act |  |  |  |  |  | 626 |
Adjustments to Additional Paid in Capital, Warrant Issued |  |  |  | 16 |  | 9 |
Total Unsecured Term Loan through PSP of CARES Act |  |  |  | 311 |  | 160 |
Additional Relief from PSP of CARES Act |  |  |  |  |  |  | $ 87
ProceedsFromPayrollSupportProgramGrant |  |  |  | $ 892 |  | 457 |
PSP Installments Received |  | $ 539 |  |  |  |  |
CARES PSP 3 [Member] |  |  |  |  |  |  |
CARES Funds Received [Line Items] |  |  |  |  |  |  |
Total Expected Relief From PSP of CARES Act | $ 585 |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Warrant Issued |  |  |  |  |  | 7 |
Total Unsecured Term Loan through PSP of CARES Act |  |  |  |  |  | 147 |
ProceedsFromPayrollSupportProgramGrant |  |  |  |  |  | $ 431 |

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