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Short-Term and Long-Term Debt (Schedule of Extinguishment of Debt) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Details underlying the recognition of gain or loss on extinguishment of debt [Abstract] |  |  |  |
Principal balance outstanding prior to payoff |  | $ 995 | $ 796 | $ 109
Unamortized debt issuance costs and discounts |  |  | (2) | (1)
Amount paid to retire debt |  | (1,003) | (809) | (150)
Gain (loss) on early extinguishment of debt, pre-tax |  | $ (8) | $ (15) | (42)
6.15% Notes, Due 2036 [Member] |  |  |  |
Details underlying the recognition of gain or loss on extinguishment of debt [Abstract] |  |  |  |
Repurchase amount |  |  |  | 105
Interest rate |  | 6.15% |  |
4.85% Notes, Due 2021 [Member] |  |  |  |
Details underlying the recognition of gain or loss on extinguishment of debt [Abstract] |  |  |  |
Principal balance outstanding prior to payoff | $ 296 |  |  |
Repurchase amount |  |  |  | $ 4
Interest rate | 4.85% | 4.85% |  |
LIBOR + 150 bps Term Loan Issued, Due 2022 [Member] |  |  |  |
Details underlying the recognition of gain or loss on extinguishment of debt [Abstract] |  |  |  |
Principal balance outstanding prior to payoff | $ 500 |  |  |
Variable rate | 1.50% |  |  |

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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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