Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Schedule of Reconciliation of Level 3 Investments Available-for-Sale Securities (Parenthetical) (Detail)

v3.7.0.1
Fair Value Measurements - Schedule of Reconciliation of Level 3 Investments Available-for-Sale Securities (Parenthetical) (Detail)
$ in Millions
Mar. 31, 2017
USD ($)
Security
Fair Value Disclosures [Abstract]  
Investment grade rated debt held for more than 12 months $ 11
Securities in unrealized loss position $ 1
Securities in unrealized loss position | Security 0