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Long-Term Debt (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |
Long-Term Debt | $ 4,890 | $ 5,640
Finance Leases (see Note 18) | 250 | 212
Less: Current Portion of Long-Term Debt | 37 | 781
Unamortized Debt Discount | 27 | 31
Debt Issuance Costs | 4 | 5
Total Long-Term Debt | 5,072 | 5,035
Proceeds from Debt, Net of Issuance Costs | 1,480 |
Long-Term Debt by Maturity [Abstract] |  |
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2022 | 0 |
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2023 | 1,250 |
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2024 | 0 |
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2025 | 500 |
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2026 | 750 |
Line of Credit Facility [Line Items] |  |
Proceeds from Debt, Net of Issuance Costs | $ 1,480 |
Eurodollar [Member] |  |
Line of Credit Facility [Line Items] |  |
Effective Interest Rate (in hundredths) | 1.00% |
Base Rate [Member] |  |
Line of Credit Facility [Line Items] |  |
Effective Interest Rate (in hundredths) | 3.25% |
Commercial Paper |  |
Line of Credit Facility [Line Items] |  |
Current Borrowings Outstanding | $ 0 | 0
Revolving Credit Agreement (New Facility) |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity | $ 2,000 |
Senior Unsecured Revolving Credit Agreement Due 2024 |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Expiration Date | Jun. 27, 2024 |
Line Of Credit Facility Increase Additional Borrowings | $ 3,000 |
Maximum total debt-to-total capitalization ratio allowed under financial covenant (in hundredths) | 65.00% |
4.100% Senior Notes due 2021 |  |
Debt Instrument [Line Items] |  |
Long-Term Debt | $ 0 | 750
Debt Instrument Issuance Face Amount | $ 750 |
Debt Instrument Issuance Interest Rate | 4.10% |
2.625% Senior Notes due 2023 |  |
Debt Instrument [Line Items] |  |
Long-Term Debt | $ 1,250 | 1,250
3.15% Senior Notes due 2025 |  |
Debt Instrument [Line Items] |  |
Long-Term Debt | 500 | 500
4.15% Senior Notes due 2026 |  |
Debt Instrument [Line Items] |  |
Long-Term Debt | 750 | 750
6.65% Senior Notes due 2028 |  |
Debt Instrument [Line Items] |  |
Long-Term Debt | 140 | 140
4.375% Senior Notes due 2030 |  |
Debt Instrument [Line Items] |  |
Long-Term Debt | 750 | 750
Debt Instrument Issuance Face Amount | $ 750 |
Debt Instrument Issuance Interest Rate | 4.375% |
3.90% Senior Notes due 2035 |  |
Debt Instrument [Line Items] |  |
Long-Term Debt | $ 500 | 500
4.95% Senior Notes due 2050 |  |
Debt Instrument [Line Items] |  |
Long-Term Debt | 750 | 750
Debt Instrument Issuance Face Amount | $ 750 |
Debt Instrument Issuance Interest Rate | 4.95% |
Senior Notes Due 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Issuance Face Amount | $ 500 |
Debt Instrument Issuance Interest Rate | 2.45% |
4.40% Senior Notes Due 2020 |  |
Debt Instrument [Line Items] |  |
Debt Instrument Issuance Face Amount | $ 500 |
Debt Instrument Issuance Interest Rate | 4.40% |
5.10% Senior Notes due 2036 |  |
Debt Instrument [Line Items] |  |
Long-Term Debt | $ 250 | $ 250

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