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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