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Income Taxes (Unrecognized Tax Benefits Information) (Details 4) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating Loss Carryforwards [Line Items] |  |  |
Unrecognized tax benefits, net of federal tax benefits, that would impact the effective tax rate | $ 80 | $ 67 | $ 70
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 2 | (2) | 2
Payable related to accrued interest and penalties | 10 | 8 |
Reconciliation of gross unrecognized tax benefits (expense) |  |  |
Beginning balance | 100 | 92 | 76
Additions based on tax positions related to the current year | 11 | 15 | 22
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions | (1) |  |
Additions for tax positions of prior years | 10 | 39 | 9
Reductions for tax positions of prior years | (4) | (17) | (3)
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | (5) |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | (1) | (29) | (12)
Ending balance | 110 | $ 100 | $ 92
Minimum [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Decrease in gross amount of unrecognized tax benefits due to resolution of IRS examinations | 20 |  |
Maximum [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Decrease in gross amount of unrecognized tax benefits due to resolution of IRS examinations | $ 30 |  |

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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 The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=120406818&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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