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Fair Value (Tables)
 12 Months Ended
Dec. 31, 2019
Fair Value Disclosures [Abstract]  
Schedule of Carrying And Fair Values Of Other Financial Assets And Liabilities The following tables present the fair values of our other financial assets and liabilities on December 31, 2019 and 2018, and the basis for determining their fair values:
 
Carrying
Value
 
Fair
Value
 
Quoted Prices in Active Markets for Identical Assets
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
Financial Assets (Liabilities)
December 31, 2019
Measured at fair value:
 
 
 
 
 
 
 
 
 
    Marketable securities held in trust:
 
 
 
 
 
 
 
 
 
        Cash and equivalents
$
24

 
$
24

 
$
11

 
$
13

 
$
—

        Available-for-sale debt securities
129

 
129

 
—

 
129

 
—

        Equity securities
54

 
54

 
54

 
—

 
—

    Other investments
4

 
4

 
—

 
—

 
4

    Cash flow hedges
26

 
26

 
—

 
26

 
—

Measured at amortized cost:
 
 
 
 
 
 
 
 
 
    Short- and long-term debt principal
(12,005
)
 
(12,339
)
 
—

 
(12,339
)
 
—

 
 
 
 
 
 
 
 
 
 
 
December 31, 2018
Measured at fair value:
 
 
 
 
 
 
 
 
 
    Marketable securities held in trust:
 
 
 
 
 
 
 
 
 
        Cash and equivalents
$
29

 
$
29

 
$
23

 
$
6

 
$
—

        Available-for-sale debt securities
121

 
121

 
—

 
121

 
—

        Equity securities
52

 
52

 
52

 
—

 
—

    Other investments
4

 
4

 
—

 
—

 
4

    Cash flow hedges
(69
)
 
(69
)
 
—

 
(69
)
 
—

Measured at amortized cost:
 
 
 
 
 
 
 
 
 
    Short- and long-term debt principal
(12,518
)
 
(12,346
)
 
—

 
(12,346
)
 
—