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Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
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Debt Disclosure [Abstract] |  |  |
Total borrowings at face value |  | $ 25,187 | $ 28,493
Unamortized premium, net |  | 660 | 670
Debt issuance costs |  | (114) | (135)
Net book value of debt |  | 25,733 | 29,028
Long-term finance leases |  | 540 | 504
Current finance leases |  | 99 | 85
Total debt and finance leases |  | 26,372 | 29,617
Less current maturities of financing leases |  | (99) | (85)
Less current maturities of long-term debt |  | (408) | (101)
Long-term debt, net | [1] | $ 25,865 | $ 29,431
[1] | Included $540 million and $504 million of finance lease liabilities as of March 31, 2022 and December 31, 2021, respectively.

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- 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=123466204&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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