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Fair Value Instruments - Carrying and Estimated Fair Value of Debt (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
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	$ 105
Stated interest rate	6.24%
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 | 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]
Net carrying amount	$ 1,963	$ 1,945
5.250 Unsecured Notes due 2025 | Unsecured Debt
Debt Instrument [Line Items]
Carrying amount of debt	$ 1,550
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	$ 159
Stated interest rate	1.34%
5.125 Notes due 2027 | Unsecured Debt
Debt Instrument [Line Items]
Carrying amount of debt	$ 2,000
Stated interest rate	5.125%
7.375% Debentures due 2027 | Unsecured Debt
Debt Instrument [Line Items]
Carrying amount of debt	$ 119
Stated interest rate	7.375%
1.60 Term Loan Agreement Payable through 2028 | Notes Payable to Banks
Debt Instrument [Line Items]
Carrying amount of debt	$ 178
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% Notes due 2027 | Unsecured Debt
Debt Instrument [Line Items]
Carrying amount of debt	$ 300
Stated interest rate	3.45%
Term Loan Agreement Due 2025 | Notes Payable to Banks
Debt Instrument [Line Items]
Carrying amount of debt	$ 112
Stated interest rate	1.59%
Term Loan Agreement Due 2028 | Notes Payable to Banks
Debt Instrument [Line Items]
Stated interest rate	1.60%
1.0 Payroll Support Program Loan due 2031 | Unsecured Debt
Debt Instrument [Line Items]
Carrying amount of debt	$ 488
Stated interest rate	1.00%
Level 2 | 2.75% Notes due 2022 | Unsecured Debt
Debt Instrument [Line Items]
Notes Payable, Fair Value	$ 309
Level 2 | Pass Through Certificates due 2022 - 6.24% | Enhanced Equipment Trust Certificate
Debt Instrument [Line Items]
Notes Payable, Fair Value	107
Level 2 | 4.750 Unsecured Notes due 2023
Debt Instrument [Line Items]
Notes Payable, Fair Value	1,350
Level 2 | 1.250 Convertible Senior Notes due 2025 | Convertible Debt [Member]
Debt Instrument [Line Items]
Notes Payable, Fair Value	3,968
Level 2 | 5.250 Unsecured Notes due 2025
Debt Instrument [Line Items]
Notes Payable, Fair Value	1,765
Level 2 | 3.00% Notes due 2026 | Unsecured Debt
Debt Instrument [Line Items]
Notes Payable, Fair Value	317
Level 2 | 5.125 Notes due 2027 | Unsecured Debt
Debt Instrument [Line Items]
Notes Payable, Fair Value	2,301
Level 2 | 7.375% Debentures due 2027 | Unsecured Debt
Debt Instrument [Line Items]
Loans Payable, Fair Value	145
Level 2 | 2.625% Notes due 2030 | Unsecured Debt
Debt Instrument [Line Items]
Notes Payable, Fair Value	492
Level 2 | 3.45% Notes due 2027 | Unsecured Debt
Debt Instrument [Line Items]
Notes Payable, Fair Value	318
Level 3 | Term Loan Agreement due 2026 - 1.99% | Notes Payable to Banks
Debt Instrument [Line Items]
Loans Payable, Fair Value	157
Level 3 | 1.60 Term Loan Agreement Payable through 2028 | Notes Payable to Banks
Debt Instrument [Line Items]
Loans Payable, Fair Value	177
Level 3 | 1.0 Payroll Support Program Loan due 2030 | Unsecured Debt
Debt Instrument [Line Items]
Notes Payable, Fair Value	941
Level 3 | Term Loan Agreement Due 2025 | Notes Payable to Banks
Debt Instrument [Line Items]
Loans Payable, Fair Value	112
Level 3 | 1.0 Payroll Support Program Loan due 2031 | Unsecured Debt
Debt Instrument [Line Items]
Notes Payable, Fair Value	$ 460

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
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-Subparagraph (b)(1)
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Fair value portion of contractual obligation to pay money on demand or on fixed or determinable dates.

+ References

No definition available.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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Fair value portion of notes payable.

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