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Fair Value Instruments - Carrying and Estimated Fair Value of Debt (Details) - USD ($) $ in Millions	Mar. 31, 2022	May 01, 2020
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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Contractual interest rate for funds borrowed, under the debt agreement.

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Fair value portion of notes payable.

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