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v3.20.2

Fair Value Instruments - Carrying and Estimated Fair Value of Debt (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Jul. 31, 2020 | Jun. 08, 2020 | May 04, 2020 | May 01, 2020
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2.65% Notes due 2020 | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Carrying amount of debt | $ 500 |  |  |  |
Stated interest rate | 2.65% |  |  |  |
2.75% Notes due 2022 | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Carrying amount of debt | $ 300 |  |  |  |
Stated interest rate | 2.75% |  |  |  |
Pass Through Certificates due 2022 - 6.24% | Enhanced Equipment Trust Certificate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Carrying amount of debt | $ 137 |  |  |  |
Stated interest rate | 6.24% |  |  |  |
4.750 Unsecured Notes due 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  |  | 4.75% | 4.75% |
4.750 Unsecured Notes due 2023 | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Carrying amount of debt | $ 1,250 |  |  |  |
Stated interest rate | 4.75% |  |  |  |
1.250 Convertible Senior Notes due 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  |  |  |  | 1.25%
1.250 Convertible Senior Notes due 2025 | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 1.25% |  |  |  |
1.250 Convertible Senior Notes due 2025 | Convertible Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Carrying amount of debt | $ 1,927 |  |  |  |
Stated interest rate |  |  |  |  | 1.25%
5.250 Unsecured Notes due 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  |  |  | 5.25% |
5.250 Unsecured Notes due 2025 | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Carrying amount of debt | $ 1,550 | $ 300 |  |  |
Stated interest rate | 5.25% |  |  |  |
3.00% Notes due 2026 | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Carrying amount of debt | $ 300 |  |  |  |
Stated interest rate | 3.00% |  |  |  |
Term Loan Agreement due 2026 - 1.99% | Notes Payable to Banks |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Carrying amount of debt | $ 169 |  |  |  |
Stated interest rate | 1.99% |  |  |  |
3.45% Notes due 2027 | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 3.45% |  |  |  |
5.125 Notes due 2027 | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Carrying amount of debt | $ 2,000 | $ 700 |  |  |
Stated interest rate | 5.125% |  |  |  |
7.375% Debentures due 2027 | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Carrying amount of debt | $ 120 |  |  |  |
Stated interest rate | 7.375% |  |  |  |
1.71 Term Loan Agreement Payable through 2028 | Notes Payable to Banks |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Carrying amount of debt | $ 190 |  |  |  |
2.625% Notes due 2030 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 2.625% |  |  |  |
2.625% Notes due 2030 | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Carrying amount of debt | $ 500 |  |  |  |
Stated interest rate | 2.625% |  |  |  |
1.0 Payroll Support Program Loan due 2030 | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Carrying amount of debt | $ 976 |  |  |  |
Stated interest rate | 1.00% |  |  |  |
3.45 Unsecured Senior Notes due 2027 | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Carrying amount of debt | $ 300 |  |  |  |
Term Loan Agreement Due 2025 | Notes Payable to Banks |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Carrying amount of debt | $ 125 |  |  |  |
Stated interest rate | 1.62% |  |  |  |
Term Loan Agreement Due 2028 | Notes Payable to Banks |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 1.62% |  |  |  |
Level 2 | 2.65% Notes due 2020 | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes Payable, Fair Value | $ 500 |  |  |  |
Level 2 | 2.75% Notes due 2022 | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes Payable, Fair Value | 308 |  |  |  |
Level 2 | Pass Through Certificates due 2022 - 6.24% | Enhanced Equipment Trust Certificate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes Payable, Fair Value | 140 |  |  |  |
Level 2 | 4.750 Unsecured Notes due 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes Payable, Fair Value | 1,337 |  |  |  |
Level 2 | 1.250 Convertible Senior Notes due 2025 | Convertible Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes Payable, Fair Value | 3,013 |  |  |  |
Level 2 | 5.250 Unsecured Notes due 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes Payable, Fair Value | 1,710 |  |  |  |
Level 2 | 3.00% Notes due 2026 | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes Payable, Fair Value | 301 |  |  |  |
Level 2 | 5.125 Notes due 2027 | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes Payable, Fair Value | 2,183 |  |  |  |
Level 2 | 7.375% Debentures due 2027 | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loans Payable, Fair Value | 142 |  |  |  |
Level 2 | 2.625% Notes due 2030 | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes Payable, Fair Value | 473 |  |  |  |
Level 2 | 3.45 Unsecured Senior Notes due 2027 | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes Payable, Fair Value | 305 |  |  |  |
Level 3 | Term Loan Agreement due 2026 - 1.99% | Notes Payable to Banks |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loans Payable, Fair Value | 162 |  |  |  |
Level 3 | 1.71 Term Loan Agreement Payable through 2028 | Notes Payable to Banks |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loans Payable, Fair Value | 179 |  |  |  |
Level 3 | 1.0 Payroll Support Program Loan due 2030 | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes Payable, Fair Value | 811 |  |  |  |
Level 3 | Term Loan Agreement Due 2025 | Notes Payable to Banks |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loans Payable, Fair Value | $ 122 |  |  |  |
Notes Payable to Banks | 1.71 Term Loan Agreement Payable through 2028 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 1.71% |  |  |  |

X
- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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