Quarterly report pursuant to Section 13 or 15(d)

Summary of Marketable Securities (Detail)

v3.19.2
Summary of Marketable Securities (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Schedule of Marketable Securities [Line Items]    
Debt Securities, Trading, Amortized Cost $ 116 $ 139
Trading Securities, Gross Unrealized Gain 0 0
Trading Securities, Gross Unrealized Loss 0 0
Debt Securities, Trading, and Equity Securities, FV-NI 116 139
Available-for-sale Securities, Amortized Cost Basis 603 674
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 7 1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax (1) (4)
Available-for-sale Securities, Current 609 671
Total Amortized Cost 719 813
Marketable Securities, Gross Unrealized Gain 7 1
Marketable Securities, Gross Unrealized Loss (1) (4)
Total Estimated Fair Value 725 810
Corporate debt securities    
Schedule of Marketable Securities [Line Items]    
Debt Securities, Trading, Amortized Cost 114 137
Trading Securities, Gross Unrealized Gain 0 0
Trading Securities, Gross Unrealized Loss 0 0
Debt Securities, Trading, and Equity Securities, FV-NI 114 137
Available-for-sale Securities, Amortized Cost Basis 220 275
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 2 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax 0 (2)
Available-for-sale Securities, Current 222 273
U.S. government and agency debt securities    
Schedule of Marketable Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 295 297
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 4 1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax (1) (1)
Available-for-sale Securities, Current 298 297
Mortgage and asset-backed debt securities    
Schedule of Marketable Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 69 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 70 81
Equity securities    
Schedule of Marketable Securities [Line Items]    
Debt Securities, Trading, Amortized Cost 2 2
Trading Securities, Gross Unrealized Gain 0 0
Trading Securities, Gross Unrealized Loss 0 0
Debt Securities, Trading, and Equity Securities, FV-NI 2 2
Non-U.S. government debt securities    
Schedule of Marketable Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 19 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 $ 19 $ 20