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Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Sale leaseback financing obligation $ 103   $ 107
Finance Lease, Liability 32   1
Total debt 3,097   3,008
Less: current maturities 11 $ 6 5
Less: debt issuance costs (26)   (23)
Long-term debt, net of current maturities 3,060   2,980
Two Thousand Eighteen Revolver [Member]      
Debt Instrument [Line Items]      
Long-term Line of Credit     700
Senior Notes [Member] | Four Point Eight Seven Five Percentage Senior Notes Due Two Thousand Twenty Three [Member]      
Debt Instrument [Line Items]      
Senior notes 1,000   1,000
Senior Notes [Member] | Five Point Five Zero Zero Percentage Senior Notes Due Two Thousand Twenty Six [Member]      
Debt Instrument [Line Items]      
Senior notes 800   800
Senior Notes [Member] | Six Percentage Senior Notes Due Two Thousand Twenty Seven [Member]      
Debt Instrument [Line Items]      
Senior notes 600   0
Senior Notes [Member] | Five Point Eight Seven Five Percentage Senior Notes Due Two Thousand Twenty Eight [Member]      
Debt Instrument [Line Items]      
Senior notes 400   $ 400
Revolving Credit Facility [Member] | Two Thousand Eighteen Revolver [Member]      
Debt Instrument [Line Items]      
Long-term Line of Credit $ 162