Quarterly report pursuant to Section 13 or 15(d)

Summary of Marketable Securities (Detail)

v3.19.1
Summary of Marketable Securities (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Schedule of Marketable Securities [Line Items]    
Debt Securities, Trading, Amortized Cost $ 115 $ 139
Trading Securities, Gross Unrealized Gain 0 0
Trading Securities, Gross Unrealized Loss 0 0
Debt Securities, Trading, and Equity Securities, FV-NI 115 139
Available-for-sale Securities, Amortized Cost Basis 596 674
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 3 1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax (2) (4)
Available-for-sale Securities, Current 597 671
Total Amortized Cost 711 813
Marketable Securities, Gross Unrealized Gain 3 1
Marketable Securities, Gross Unrealized Loss (2) (4)
Total Estimated Fair Value 712 810
Corporate debt securities    
Schedule of Marketable Securities [Line Items]    
Debt Securities, Trading, Amortized Cost 113 137
Trading Securities, Gross Unrealized Gain 0 0
Trading Securities, Gross Unrealized Loss 0 0
Debt Securities, Trading, and Equity Securities, FV-NI 113 137
Available-for-sale Securities, Amortized Cost Basis 210 275
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 1 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax (1) (2)
Available-for-sale Securities, Current 210 273
U.S. government and agency debt securities    
Schedule of Marketable Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 293 297
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 1 1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax (1) (1)
Available-for-sale Securities, Current 293 297
Mortgage and asset-backed debt securities    
Schedule of Marketable Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 73 82
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 1 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax 0 (1)
Available-for-sale Securities, Current 74 81
Equity securities    
Schedule of Marketable Securities [Line Items]    
Debt Securities, Trading, Amortized Cost 2 0
Trading Securities, Gross Unrealized Gain 0 0
Trading Securities, Gross Unrealized Loss 0 0
Debt Securities, Trading, and Equity Securities, FV-NI 2 0
Non-U.S. government debt securities    
Schedule of Marketable Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 20 20
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax 0 0
Available-for-sale Securities, Current $ 20 $ 20