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Income Taxes (Changes in Liability for Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Beginning balance of gross unrecognized tax benefits | $ 207 | $ 18 | $ 22
Increases: Positions taken during a prior period |  | 212 | 4
Decreases: Positions taken during a prior period | (77) | (16) | (3)
Decreases: Settlements with taxing authorities |  | (7) | (4)
Decreases: Reductions resulting from lapse of statute of limitations |  |  | (1)
Ending balance of gross unrecognized tax benefits | 130 | 207 | 18
Favorable (unfavorable) impact if recognized | $ 76 | $ 76 | $ 17

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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=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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