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Income Taxes, Tax Credits and Loss Carryforwards (Details) - U.S. state income tax credits [Member] $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Operating Loss Carryforwards |
U.S. state NOLs (gross amount) | $ 9,441
U S State Income Tax Credits Limited [Member] |
Operating Loss Carryforwards |
U.S. state income tax credits | 76
U S State Income Tax Credits Unlimited [Member] |
Operating Loss Carryforwards |
U.S. state income tax credits | $ 11
Minimum [Member] |
Operating Loss Carryforwards |
U.S state NOL (gross amount) | Dec. 31, 2018
Minimum [Member] | U S State Income Tax Credits Limited [Member] |
Operating Loss Carryforwards |
U.S state income tax credits | Dec. 31, 2018
Maximum [Member] |
Operating Loss Carryforwards |
U.S state NOL (gross amount) | Dec. 31, 2037
Maximum [Member] | U S State Income Tax Credits Limited [Member] |
Operating Loss Carryforwards |
U.S state income tax credits | Dec. 31, 2031

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