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Debt (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments [Table Text Block] | The Company’s long-term debt consists of the following as of December 31, 2020 and 2019 (dollars in millions):
|  | 2020 |  | 2019
$400 million 5.00% Senior Notes due 2021 |  | $ | 400 |  |  | $ | 400 |
$400 million 4.70% Senior Notes due 2023 |  | 399 |  |  | 399 |
$400 million 3.95% Senior Notes due 2026 |  | 400 |  |  | 400 |
$600 million 3.90% Senior Notes due 2029 |  | 599 |  |  | 599 |
$600 million 3.15% Senior Notes due 2030 |  | 597 |  |  | — |
$100 million 4.09% Promissory Note due 2039 |  | 83 |  |  | 86 |
$400 million 6.20% Subordinated Debentures due 2042 |  | 400 |  |  | 400 |
$400 million 5.75% Subordinated Debentures due 2056 |  | 400 |  |  | 400 |
$400 million Variable Rate Junior Subordinated Debentures due 2065 |  | 319 |  |  | 319 |
Sub-total |  | 3,597 |  |  | 3,003 |
Unamortized issuance costs |  | (24) |  |  | (22) |
Long-term Debt |  | $ | 3,573 |  |  | $ | 2,981 |
Schedule of Maturities of Long-term Debt [Table Text Block] | Future principal payments due on long-term debt, excluding discounts, as of December 31, 2020, were as follows (dollars in millions):
| Calendar Year
| 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | Thereafter
Long-term debt | $ | 403 |  |  | $ | 3 |  |  | $ | 403 |  |  | $ | 3 |  |  | $ | 4 |  |  | $ | 2,787 |
Schedule of Line of Credit Facilities [Table Text Block] | The following table provides additional information on the Company’s existing committed credit facilities as of December 31, 2020 and 2019 (dollars in millions):
|  |  |  | Amount Utilized(1) December 31, |  |
Current Capacity |  | Maturity Date |  | 2020 |  | 2019 |  | Basis of Fees
$ | 75 |  |  | June 2021 |  | $ | 51 |  |  | $ | 15 |  |  | Fixed
100 |  |  | August 2021 |  | 100 |  |  | — |  |  | Fixed
150 |  |  | September 2021 |  | 150 |  |  | — |  |  | Fixed
107 |  |  | March 2022 |  | 107 |  |  | 99 |  |  | Fixed
500 |  |  | May 2022 |  | 210 |  |  | 375 |  |  | Debt rating and utilization %
100 (2) |  | December 2022 |  | 100 |  |  | 105 |  |  | Fixed
100 |  |  | May 2023 |  | 75 |  |  | 61 |  |  | Fixed
850 |  |  | August 2023 |  | 21 |  |  | 20 |  |  | Senior unsecured long-term debt rating
(1)Represents issued but undrawn letters of credit. There was no cash borrowed for the periods presented. (2)Foreign currency denominated facility, amounts presented are in U.S. dollars.

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: 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 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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