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Investments (Tables)
 6 Months Ended
Jun. 30, 2018
Investments [Line Items]  
Investment Summary
(in millions)
June 30,
2018
 
December 31,
2017
Equity method
$
4,007

 
$
3,546

Marketable equity securities
451

 
433

Nonmarketable equity securities
1,279

 
1,186

Other investments
1,783

 
1,785

Total investments
7,520

 
6,950

Less: Current investments
82

 
19

Noncurrent investments
$
7,438

 
$
6,931
Investment and Other Income (Loss), Net
Investment and Other Income (Loss), Net
 
Three Months Ended
June 30
 
Six Months Ended
June 30
(in millions)
2018
 
2017
 
2018
 
2017
Equity in net income (losses) of investees, net
$
69

 
$
15

 
$
20

 
$
51

Realized and unrealized gains (losses) on equity securities, net
(40
)
 
(2
)
 
(12
)
 
(7
)
Other income (loss), net
48

 
86

 
195

 
185

Investment and other income (loss), net
$
77

 
$
99

 
$
203

 
$
229
NBCUniversal Media LLC [Member]  
Investments [Line Items]  
Investment Summary
(in millions)
June 30,
2018
 
December 31,
2017
Equity method
$
719

 
$
690

Marketable equity securities
385

 
430

Nonmarketable equity securities
712

 
696

Total investments
$
1,816

 
$
1,816
Investment and Other Income (Loss), Net
Investment and Other Income (Loss), Net
 
Three Months Ended
June 30
 
Six Months Ended
June 30
(in millions)
2018
 
2017
 
2018
 
2017
Equity in net income (losses) of investees, net
$
(87
)
 
$
(29
)
 
$
(187
)
 
$
(55
)
Realized and unrealized gains (losses) on equity securities, net
(74
)
 
—

 
(37
)
 
2

Other income (loss), net
(7
)
 
14

 
52

 
37

Investment and other income (loss), net
$
(168
)
 
$
(15
)
 
$
(172
)
 
$
(16
)