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Comprehensive Income And Accumulated Other Comprehensive Income - Changes in Components of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Jan. 01, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance $ 459        
Other comprehensive income/(loss) before reclassifications (25) $ (256) $ 196    
Amounts reclassified from AOCI 32 4 (4)    
Other comprehensive income/(loss) (13) (254) 192    
Ending balance 612 459      
Pension and Other Retirement Benefits          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance (53) (61) (79)    
Other comprehensive income/(loss) before reclassifications (24) 4 13    
Amounts reclassified from AOCI 2 4 5    
Other comprehensive income/(loss) (39) 8 18    
Ending balance (92) (53) (61)    
Gains / (Losses) on Cash Flow Hedges          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance 0 1 2    
Other comprehensive income/(loss) before reclassifications 0 (1) 6    
Amounts reclassified from AOCI 0 0 (7)    
Other comprehensive income/(loss) 0 (1) (1)    
Ending balance 0 0 1    
Foreign Currency Translation Adjustments          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance (406) (113) (325)    
Other comprehensive income/(loss) before reclassifications (27) (293) 212    
Amounts reclassified from AOCI 32 0 0    
Other comprehensive income/(loss) 5 (293) 212    
Ending balance (401) (406) (113)    
Net Investment Hedges          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance 33 (1) 35    
Other comprehensive income/(loss) before reclassifications 26 34 (36)    
Amounts reclassified from AOCI (2) 0 0    
Other comprehensive income/(loss) 21 34 (36)    
Ending balance 54 33 (1)    
Gains on Available for Sale Securities          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance 0 2 3    
Other comprehensive income/(loss) before reclassifications   0 1    
Amounts reclassified from AOCI   0 (2)    
Other comprehensive income/(loss)   (2) (1)    
Ending balance   0 2    
Total          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Beginning balance (426) (172) (364)    
Ending balance $ (439) $ (426) $ (172)    
Accounting Standards Update 2018-02          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Cumulative Effect of New Accounting Principle in Period of Adoption       $ (20)  
Accounting Standards Update 2018-02 | Pension and Other Retirement Benefits          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Cumulative Effect of New Accounting Principle in Period of Adoption       (17) $ 0
Accounting Standards Update 2018-02 | Gains / (Losses) on Cash Flow Hedges          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Cumulative Effect of New Accounting Principle in Period of Adoption       0 0
Accounting Standards Update 2018-02 | Foreign Currency Translation Adjustments          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Cumulative Effect of New Accounting Principle in Period of Adoption       0 0
Accounting Standards Update 2018-02 | Net Investment Hedges          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Cumulative Effect of New Accounting Principle in Period of Adoption       $ (3) 0
Accounting Standards Update 2016-01          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Cumulative Effect of New Accounting Principle in Period of Adoption         (2)
Accounting Standards Update 2016-01 | Gains on Available for Sale Securities          
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]          
Cumulative Effect of New Accounting Principle in Period of Adoption         $ (2)