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Financing Activities (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Debt Instrument [Line Items] |  |
Debt Instrument, Maturity Date | Jun. 15, 2030 | May 15, 2029
Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Issuance Date | Jun. 09, 2020 | May 15, 2019
Debt Instrument, Interest Rate, Stated Percentage | 3.15% | 3.90%
Debt Instrument, Face Amount | $ 600 | $ 600
Long-term Debt, Gross | 593 | 594
Debt Issuance Costs, Net | $ 5 | $ 5
Senior Notes Due 2021 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.00% |
Debt Instrument, Face Amount | $ 400 |
Senior Notes Due 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.45%
Debt Instrument, Face Amount |  | $ 400

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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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