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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]      
Schedule II - Valuation and Qualifying Accounts
Schedule II – Valuation and Qualifying Accounts
Allowance for Doubtful Accounts for the Years Ended December 31, 2019, 2018, and 2017
($ in millions)
Balance at Beginning of Year

Charged to Costs and Expenses

Deductions(1)

Balance at End of Year

2019

$24


$24


($26
)

$22

2018

$25


$18


($19
)

$24

2017

$36


$15


($26
)

$25

(1)
Notes and accounts receivable written off as uncollectible, net of recoveries, amounts attributable to divestitures and changes attributable to foreign currency translation.
    
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 164    
Balance at End of Year 158 $ 164  
SEC Schedule, 12-09, Allowance, Credit Loss [Member]      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 24 25 $ 36
Charged to Costs and Expenses 24 18 15
Deductions (26) (19) (26)
Balance at End of Year $ 22 $ 24 $ 25