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v3.21.2

Fair Value Instruments - Carrying and Estimated Fair Value of Debt (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020 | May 01, 2020
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Unsecured Debt | 2.75% Notes due 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 | $ 2,000 |  |
Unsecured Debt | 7.375% Debentures due 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 7.375% |  |
Carrying value | $ 118 |  |
Unsecured Debt | 2.625% Notes due 2030 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 2.625% |  |
Carrying value | $ 500 |  |
Unsecured Debt | 1.000% Payroll Support Program Loan due April 2030 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 1.00% |  |
Carrying value | $ 976 |  |
Unsecured Debt | 1.000% Payroll Support Program Loan due January 2031 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 1.00% |  |
Carrying value | $ 566 |  |
Unsecured Debt | 1.000% Payroll Support Program Loan due April 2031 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 1.00% |  |
Carrying value | $ 526 |  |
Enhanced Equipment Trust Certificate | Pass Through Certificates due 2022 - 6.24% |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 6.24% |  |
Carrying value | $ 105 |  |
Convertible Debt | 1.25% Convertible Notes due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 1.25% |  | 1.25%
Carrying value | $ 1,982 | $ 1,945 |
Notes Payable to Banks | Term Loan Agreement payable through 2025 - 1.55% |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 1.55% |  |
Carrying value | $ 106 |  |
Notes Payable to Banks | Term Loan Agreement payable through 2026 - 1.31% |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 1.31% |  |
Carrying value | $ 149 |  |
Notes Payable to Banks | Term Loan Agreement payable through 2028 - 1.55% |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 1.55% |  |
Carrying value | $ 171 |  |
Level 2 | Unsecured Debt | 2.75% Notes due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable, Estimated Fair Value | 308 |  |
Level 2 | Unsecured Debt | 4.75% Notes due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable, Estimated Fair Value | 1,342 |  |
Level 2 | Unsecured Debt | 5.25% Notes due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable, Estimated Fair Value | 1,770 |  |
Level 2 | Unsecured Debt | 3.00% Notes due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable, Estimated Fair Value | 321 |  |
Level 2 | Unsecured Debt | 3.45% Notes due 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable, Estimated Fair Value | 326 |  |
Level 2 | Unsecured Debt | 5.125% Notes due 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable, Estimated Fair Value | 2,355 |  |
Level 2 | Unsecured Debt | 7.375% Debentures due 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Loans payable, Estimated Fair Value | 146 |  |
Level 2 | Unsecured Debt | 2.625% Notes due 2030 |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable, Estimated Fair Value | 513 |  |
Level 2 | Enhanced Equipment Trust Certificate | Pass Through Certificates due 2022 - 6.24% |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable, Estimated Fair Value | 108 |  |
Level 2 | Convertible Debt | 1.25% Convertible Notes due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable, Estimated Fair Value | 3,494 |  |
Level 3 | Unsecured Debt | 1.000% Payroll Support Program Loan due April 2030 |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable, Estimated Fair Value | 956 |  |
Level 3 | Unsecured Debt | 1.000% Payroll Support Program Loan due January 2031 |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable, Estimated Fair Value | 542 |  |
Level 3 | Unsecured Debt | 1.000% Payroll Support Program Loan due April 2031 |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable, Estimated Fair Value | 500 |  |
Level 3 | Notes Payable to Banks | Term Loan Agreement payable through 2025 - 1.55% |  |  |
Debt Instrument [Line Items] |  |  |
Loans payable, Estimated Fair Value | 106 |  |
Level 3 | Notes Payable to Banks | Term Loan Agreement payable through 2026 - 1.31% |  |  |
Debt Instrument [Line Items] |  |  |
Loans payable, Estimated Fair Value | 146 |  |
Level 3 | Notes Payable to Banks | Term Loan Agreement payable through 2028 - 1.55% |  |  |
Debt Instrument [Line Items] |  |  |
Loans payable, Estimated Fair Value | $ 171 |  |

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