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Income Taxes - Deferred Tax Assets and Valuation Allowance, Taxes Receivable and Payable (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Taxes receivable and payable |  |  |
Valuation allowance - current period activities | $ 3,492 | $ 106 | $ (455)
NOLs untilized | 593 |  |
Deferred tax liability |  | 19 |
Deferred tax asset | 3,269 |  |
Net deferred tax asset | 3,500 | 3,800 |
Valuation allowance | 242 | $ 3,812 |
Current taxes payable | 13 |  |
Current taxes receivable | 1 |  |
Federal Tax Authority |  |  |
Taxes receivable and payable |  |  |
Operating loss carryforwards | 2,100 |  |
State and Local Jurisdiction |  |  |
Taxes receivable and payable |  |  |
Operating loss carryforwards | 360 |  |
Foreign Tax Authority |  |  |
Taxes receivable and payable |  |  |
Operating loss carryforwards | $ 105 |  |

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- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations. + References Reference 1: 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(a)(15)(b)(1)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: 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(15)(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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(20)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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