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Fair Value Measurements Changes in Fair Value Level 3 (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Fair Value, Measurements, Nonrecurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impairment of Long-Lived Assets Held-for-use | $ 5 | $ 10 | $ 9
Inventory Write-down |  | 8 |
Impairment of Long-Lived Assets to be Disposed of |  | 68 |
Level 3 | Recurring measurement |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of asset measured on a recurring basis | 372 | 278 | $ 211
Fair value, measurement with unobservable inputs reconciliation, recurring basis, assets, unrealized gain (loss) | 95 | 67 |
Fair value, measurement with unobservable inputs reconciliation, recurring basis, assets, other | (1) | 0 |
Equity securities | Recurring measurement | Holding Company |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of asset measured on a recurring basis | $ 369 | $ 274 |

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