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Financing (LYONS) (Narrative) (Details) $ / shares in Units, shares in Thousands, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 22, 2021 USD ($) shares | Dec. 31, 2020 $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) | Dec. 31, 2001 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Common stock par value | $ / shares |  | $ 0.01 | $ 0.01 | $ 0.01 |  |
Convertible debt | Zero-coupon LYONS due 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 830
Proceeds from borrowings (maturities longer than 90 days) |  |  |  |  |  | 505
Repayments of long-term lines of credit |  |  |  |  |  | $ 100
Interest rate of debt instrument |  | 0.00% | 0.00% |  |  | 2.375%
Debt instrument, convertible, conversion ratio |  |  |  |  |  | 0.381998
Debt conversion, converted instrument, shares issued | shares |  | 24,000 | 367 |  |  |
Debt conversion, converted instrument, deferred tax liability |  |  | $ 43 |  |  |
Average market price percentage for measurement period resulting in payment of contingent interest to debt instrument holders |  |  |  |  |  | 120.00%
Debt instrument percentage |  |  |  |  |  | 0.0315%
Debt instrument, periodic payment, interest |  |  | $ 1 | $ 1 | $ 2 |
Convertible debt | Zero-coupon LYONS due 2021 | Subsequent event |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt conversion, converted instrument, shares issued | shares | 912 |  |  |  |  |
Debt conversion, converted instrument, deferred tax liability | $ 10 |  |  |  |  |
Debt conversion, amount | $ 24 |  |  |  |  |

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