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Taxes (Details 4) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Changes in unrecognized tax benefits |  |  |
Beginning balance | $ 158 | $ 80 | $ 84
Current year increases | 22 | 125 | 2
Prior year decreases | (12) | (45) |
Decrease for lapse in statute | (4) | (2) | (6)
Ending balance | $ 164 | $ 158 | $ 80

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