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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Effective tax rate on income from continuing operations (as a percent) | 15.40% | 14.40% | 15.80% | 14.90% |
Benefits Tax Planning and Completion of Audits |  | $ 20 |  | $ 20 |
Valuation allowance | $ 22 |  | $ 22 |  | $ 20
Gross unrecognized tax benefits | 107 |  | 107 |  | 92
Unrecognized tax benefits net of federal tax benefits that would affect the effective tax rate | 71 |  | 71 |  | 70
Increase (decrease) in interest and penalties | 1 | $ 0 | 1 | $ 1 |
Payable related to accrued interest and penalties | 11 |  | 11 |  | $ 10
Minimum [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Decrease in gross unrecognized tax benefits due to resolution of audits and statute expirations | 50 |  | 50 |  |
Maximum [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Decrease in gross unrecognized tax benefits due to resolution of audits and statute expirations | 60 |  | 60 |  |
State and Local [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
State net operating losses | $ 21 |  | $ 21 |  |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: 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.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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