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Non-Marketable Investments (Tables)
 12 Months Ended
Dec. 31, 2016
Investments, All Other Investments [Abstract]  
Investment in other assets
The following table presents a reconciliation for our non-marketable debt securities measured and recorded at fair value on a recurring basis, using significant unobservable inputs (Level 3) (in millions):
 
Year Ended December 31
2015
 
2016
Beginning balance
$
90

 
$
1,024

Total net gains or losses
 
 
 
    Included in other comprehensive income
0

 
106

Purchases
960

 
78

Sales
(6
)
 
(18
)
Settlements
(20
)
 
(25
)
Ending balance
$
1,024

 
$
1,165