v3.10.0.1
Accumulated Other Comprehensive Income (Loss), Net of Tax - Schedule of Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance $ 13,716 $ 11,156 $ 11,803
Total other comprehensive income (loss) (54) 143 (147)
Balance 10,690 13,716 11,156
Currency Translation Differences [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 269 113  
Other comprehensive income (loss) before reclassifications (51) 156  
Amounts reclassified out of accumulated other comprehensive income (loss) 0 0  
Income tax effects 0 0  
Total other comprehensive income (loss) (51) 156  
Balance 218 269 113
Change in Fair Value Cash Flow Hedges [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 8 (2)  
Other comprehensive income (loss) before reclassifications (10) 29  
Amounts reclassified out of accumulated other comprehensive income (loss) (4) (15)  
Income tax effects 3 (4)  
Total other comprehensive income (loss) (11) 10  
Balance (3) 8 (2)
Net Actuarial Gain/(Losses) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (97) (81)  
Other comprehensive income (loss) before reclassifications 9 (20)  
Amounts reclassified out of accumulated other comprehensive income (loss) 0 0  
Income tax effects (4) 4  
Total other comprehensive income (loss) 5 (16)  
Balance (92) (97) (81)
Unrealized Gains/Losses Available-for Sale Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (3) 4  
Other comprehensive income (loss) before reclassifications 0 (3)  
Amounts reclassified out of accumulated other comprehensive income (loss) 3 (6)  
Income tax effects 0 2  
Total other comprehensive income (loss) 3 (7)  
Balance 0 (3) 4
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 177 34 181
Other comprehensive income (loss) before reclassifications (52) 162  
Amounts reclassified out of accumulated other comprehensive income (loss) (1) (21)  
Income tax effects (1) 2  
Total other comprehensive income (loss) (54) 143  
Balance $ 123 $ 177 $ 34