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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Deferred Compensation Plans
Year ended December 31 (in millions)
2019

2018

2017

Benefit obligation
$
3,273

$
2,885

$
2,539

Interest expense
$
285

$
222

$
209
NBCUniversal Media LLC [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Deferred Compensation Plans
Year ended December 31 (in millions)
2019

2018

2017

Benefit obligation
$
858

$
719

$
621

Interest expense
$
99

$
58

$
64