XML 59 R46.htm IDEA: XBRL DOCUMENT v3.19.1
Debt - Fair Value of Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Debt    
Total debt at par value $ 10,307 $ 9,308
Unamortized premium and debt issue cost, net 82 60
Total debt 10,389 9,368
Fair value $ 10,600 $ 9,400