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Fair Value Instruments - Carrying and Estimated Fair Value of Debt (Details) - USD ($) $ in Millions | Mar. 31, 2022 | May 01, 2020
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Unsecured Debt | 2.75% Notes due November 2022 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 2.75% |
Carrying value | $ 300 |
Unsecured Debt | 4.75% Notes due 2023 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.75% |
Carrying value | $ 1,250 |
Unsecured Debt | 5.25% Notes due 2025 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 5.25% |
Carrying value | $ 1,550 |
Unsecured Debt | 3.00% Notes due 2026 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.00% |
Carrying value | $ 300 |
Unsecured Debt | 3.45% Notes due 2027 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.45% |
Carrying value | $ 300 |
Unsecured Debt | 5.125% Notes due 2027 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 5.125% |
Carrying value | $ 1,970 |
Unsecured Debt | 7.375% Debentures due 2027 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 7.375% |
Carrying value | $ 116 |
Unsecured Debt | 2.625% Notes due 2030 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 2.625% |
Carrying value | $ 500 |
Unsecured Debt | 1.000% PSP1 due 2030 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 1.00% |
Carrying value | $ 976 |
Unsecured Debt | 1.000% PSP2 due 2031 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 1.00% |
Carrying value | $ 566 |
Unsecured Debt | 1.000% PSP3 due 2031 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 1.00% |
Carrying value | $ 526 |
Enhanced Equipment Trust Certificate | Pass Through Certificates due August 2022 - 6.19% |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 6.19% |
Carrying value | $ 33 |
Convertible Debt |  |
Debt Instrument [Line Items] |  |
Stated interest rate |  | 1.25%
Convertible Debt | 1.25% Convertible Notes due 2025 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 1.25% |
Carrying value | $ 1,933 |
Level 2 | Unsecured Debt | 2.75% Notes due November 2022 |  |
Debt Instrument [Line Items] |  |
Notes payable, Estimated Fair Value | 301 |
Level 2 | Unsecured Debt | 4.75% Notes due 2023 |  |
Debt Instrument [Line Items] |  |
Notes payable, Estimated Fair Value | 1,280 |
Level 2 | Unsecured Debt | 5.25% Notes due 2025 |  |
Debt Instrument [Line Items] |  |
Notes payable, Estimated Fair Value | 1,627 |
Level 2 | Unsecured Debt | 3.00% Notes due 2026 |  |
Debt Instrument [Line Items] |  |
Notes payable, Estimated Fair Value | 295 |
Level 2 | Unsecured Debt | 3.45% Notes due 2027 |  |
Debt Instrument [Line Items] |  |
Notes payable, Estimated Fair Value | 297 |
Level 2 | Unsecured Debt | 5.125% Notes due 2027 |  |
Debt Instrument [Line Items] |  |
Notes payable, Estimated Fair Value | 2,106 |
Level 2 | Unsecured Debt | 7.375% Debentures due 2027 |  |
Debt Instrument [Line Items] |  |
Loans payable, Estimated Fair Value | 131 |
Level 2 | Unsecured Debt | 2.625% Notes due 2030 |  |
Debt Instrument [Line Items] |  |
Notes payable, Estimated Fair Value | 459 |
Level 2 | Enhanced Equipment Trust Certificate | Pass Through Certificates due August 2022 - 6.19% |  |
Debt Instrument [Line Items] |  |
Notes payable, Estimated Fair Value | 33 |
Level 2 | Convertible Debt | 1.25% Convertible Notes due 2025 |  |
Debt Instrument [Line Items] |  |
Notes payable, Estimated Fair Value | 2,644 |
Level 3 | Unsecured Debt | 1.000% PSP1 due 2030 |  |
Debt Instrument [Line Items] |  |
Notes payable, Estimated Fair Value | 919 |
Level 3 | Unsecured Debt | 1.000% PSP2 due 2031 |  |
Debt Instrument [Line Items] |  |
Notes payable, Estimated Fair Value | 523 |
Level 3 | Unsecured Debt | 1.000% PSP3 due 2031 |  |
Debt Instrument [Line Items] |  |
Notes payable, Estimated Fair Value | $ 483 |

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