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Debt (Schedule of Long-term Debt Instruments) (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2006
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 3,597,000,000 | $ 3,003,000,000 |
Debt Issuance Cost | 24,000,000 | 22,000,000 |
Debt Instrument, Face Amount |  |  | $ 850,000,000
Long-term debt | 3,573,000,000 | 2,981,000,000 |
Senior Notes Due 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 400,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.45% |  |
Senior Notes Due 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 400,000,000 | 400,000,000 |
Debt Instrument, Face Amount | $ 400,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.00% |  |
Senior Notes Due 2023 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 399,000,000 | 399,000,000 |
Debt Instrument, Face Amount | $ 400,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.70% |  |
Senior Notes Due 2026 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 400,000,000 | 400,000,000 |
Debt Instrument, Face Amount | $ 400,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.95% |  |
Senior Notes Due 2029 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 599,000,000 | 599,000,000 |
Debt Instrument, Face Amount | $ 600,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.90% |  |
Subordinated Debentures Due 2042 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 400,000,000 | 400,000,000 |
Debt Instrument, Face Amount | $ 400,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.20% |  |
Subordinated Debentures Due 2056 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 400,000,000 | 400,000,000 |
Debt Instrument, Face Amount | $ 400,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.75% |  |
Junior Subordinated Debentures Due 2065 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 319,000,000 | 319,000,000 |
Debt Instrument, Face Amount | $ 400,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.82% |  |
Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 83,000,000 | 86,000,000 |
Debt Instrument, Face Amount | $ 100,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.09% |  |
Senior Notes Due 2030 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 597,000,000 | $ 0 |
Debt Instrument, Face Amount | $ 600,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.15% |  |

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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=120520924&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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