v3.8.0.1
Intangible Assets
3 Months Ended
Mar. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]  
Intangible Assets

10.  Intangible Assets

The carrying amounts of identifiable intangible assets are summarized as follows:

 

(in millions)

 

Indefinite-lived

 

 

Finite-lived

 

 

Total

 

December 31, 2017

 

$

17,178

 

 

$

211

 

 

$

17,389

 

Amortization expense

 

 

 

 

 

(11

)

 

 

(11

)

March 31, 2018

 

$

17,178

 

 

$

200

 

 

$

17,378