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Income Taxes (Unrecognized Tax Benefits Information) (Details 4) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Loss Carryforwards [Line Items] |  |  |
Deferred Tax Assets, Operating Loss Carryforwards | $ 16 |  |
Unrecognized tax benefits, net of federal tax benefits, that would impact the effective tax rate | 67 | $ 70 | $ 58
Increase (decrease) in interest and penalties | 2 | 2 | 0
Payable related to accrued interest and penalties | 8 | 10 |
Reconciliation of gross unrecognized tax benefits (expense) |  |  |
Beginning balance | 92 | 76 | 115
Additions based on tax positions related to the current year | 15 | 22 | 16
Additions for tax positions of prior years | 39 | 9 | 3
Reductions for tax positions of prior years | (17) | (3) | (57)
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | (29) | (12) | (1)
Ending balance | 100 | $ 92 | $ 76
Minimum [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Decrease in gross amount of unrecognized tax benefits due to resolution of IRS examinations | 40 |  |
Maximum [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Decrease in gross amount of unrecognized tax benefits due to resolution of IRS examinations | 50 |  |
State and Local Jurisdiction [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating Loss Carryforwards, Valuation Allowance | $ 13 |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117330534&loc=d3e28680-109314 + Details
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