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Change in Accounting Estimate (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018
--- | --- | --- | ---
Retained Earnings (Accumulated Deficit) | $ 17,945 | $ 15,967 |
Restatement Adjustment | Accumulated other comprehensive income (loss) | ASU 2017-12 |  |  |
Retained Earnings (Accumulated Deficit) |  |  | $ 20

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