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Accumulated Other Comprehensive Loss and Shareholders' Equity - Changes in Shareholders' Equity (Deficit) (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
(Increase) Decrease in Shareholders' Deficit [Roll Forward]    
Balance at beginning of period $ 430 $ 703
Net (loss) income (11) 31
Other comprehensive income (loss) (155) (378)
Dividends   (156)
Stock-based compensation plans (30) (55)
Purchase of treasury stock   (150)
Balance at end of period 234 $ (20)
Accounting standards update   us-gaap:AccountingStandardsUpdate201602Member
Cash dividends (in USD per share)   $ 0.48
Cumulative Effect, Period of Adoption, Adjustment    
(Increase) Decrease in Shareholders' Deficit [Roll Forward]    
Balance at beginning of period   $ (15)
Class A Common Stock    
(Increase) Decrease in Shareholders' Deficit [Roll Forward]    
Balance at beginning of period $ 5 $ 5
Balance at beginning of period (in shares) 324.4 324.0
Stock-based compensation plans (in shares) 1.2 1.2
Purchase of treasury stock (in shares)   (1.0)
Balance at end of period $ 5 $ 5
Balance at end of period (in shares) 325.6 324.2
Class A Common Stock | Cumulative Effect, Period of Adoption, Adjustment    
(Increase) Decrease in Shareholders' Deficit [Roll Forward]    
Balance at beginning of period   $ 0
Additional Paid-in-Capital    
(Increase) Decrease in Shareholders' Deficit [Roll Forward]    
Balance at beginning of period $ 5,851 5,800
Stock-based compensation plans (64) (89)
Balance at end of period 5,787 5,711
Additional Paid-in-Capital | Cumulative Effect, Period of Adoption, Adjustment    
(Increase) Decrease in Shareholders' Deficit [Roll Forward]    
Balance at beginning of period   0
Retained Earnings    
(Increase) Decrease in Shareholders' Deficit [Roll Forward]    
Balance at beginning of period 9,206 9,644
Net (loss) income (11) 31
Dividends   (156)
Balance at end of period 9,195 9,504
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment    
(Increase) Decrease in Shareholders' Deficit [Roll Forward]    
Balance at beginning of period   (15)
Treasury Stock, at Cost    
(Increase) Decrease in Shareholders' Deficit [Roll Forward]    
Balance at beginning of period (14,497) (14,385)
Stock-based compensation plans 34 34
Purchase of treasury stock   (150)
Balance at end of period (14,463) (14,501)
Treasury Stock, at Cost | Cumulative Effect, Period of Adoption, Adjustment    
(Increase) Decrease in Shareholders' Deficit [Roll Forward]    
Balance at beginning of period   0
Accumulated Other Comprehensive Loss    
(Increase) Decrease in Shareholders' Deficit [Roll Forward]    
Balance at beginning of period (135) (361)
Other comprehensive income (loss) (155) (378)
Balance at end of period $ (290) (739)
Accumulated Other Comprehensive Loss | Cumulative Effect, Period of Adoption, Adjustment    
(Increase) Decrease in Shareholders' Deficit [Roll Forward]    
Balance at beginning of period   $ 0