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Comprehensive Income - Schedule of Changes in Balances of Each Component of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated Other Comprehensive Income (Loss), Restated         $ 42 $ (49)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets         0 0
Changes In Accumulated Other Comprehensive Income [Roll Forward]            
Beginning Balance $ (149) $ 23 $ 42 $ (49)    
Other comprehensive income before reclassifications (111) (33) 75 (121)    
Amounts reclassified from accumulated other comprehensive income (11) (36) (15) (53)    
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 100 (3) (90) 68    
Ending Balance (48) 19 (48) 19    
Income Tax Expense (Benefit) 2 28 (4) 30    
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]            
Changes In Accumulated Other Comprehensive Income [Roll Forward]            
Beginning Balance 5 142 151 86    
Other comprehensive income before reclassifications (114) (51) 25 (124)    
Amounts reclassified from accumulated other comprehensive income (10) (36) (17) (53)    
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 104 15 (42) 71    
Ending Balance 109 157 109 157    
Accumulated Translation Adjustment [Member]            
Changes In Accumulated Other Comprehensive Income [Roll Forward]            
Beginning Balance (162) (127) (116) (142)    
Other comprehensive income before reclassifications 2 19 48 4    
Amounts reclassified from accumulated other comprehensive income 0 0 0 0    
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (2) (19) (48) (4)    
Ending Balance (164) (145) (164) (145)    
Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets         $ 0 $ 0
Changes In Accumulated Other Comprehensive Income [Roll Forward]            
Beginning Balance 2 (2) (2) (2)    
Other comprehensive income before reclassifications 0 0 0 0    
Amounts reclassified from accumulated other comprehensive income (1) 0 2 0    
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (1) 0 2 0    
Ending Balance 0 (2) 0 (2)    
Other Postretirement Benefits Plan [Member]            
Changes In Accumulated Other Comprehensive Income [Roll Forward]            
Beginning Balance 6 9 8 9    
Other comprehensive income before reclassifications 0 0 2 (1)    
Amounts reclassified from accumulated other comprehensive income 0 0 0 (1)    
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 0 0 (2) 0    
Ending Balance 6 9 6 9    
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Available-for-Sale Securities [Member]            
Changes In Accumulated Other Comprehensive Income [Roll Forward]            
Income Tax Expense (Benefit) 1 5 1 5    
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member]            
Changes In Accumulated Other Comprehensive Income [Roll Forward]            
Income Tax Expense (Benefit)     0      
Reclassification out of Accumulated Other Comprehensive Income [Member] | Other Postretirement Benefits Plan [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax 0 0 0 0    
Changes In Accumulated Other Comprehensive Income [Roll Forward]            
Amounts reclassified from accumulated other comprehensive income 0 0 0 (1)    
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax 0 0 0 0    
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest 0 0 0 (1)    
Income Tax Expense (Benefit) $ 0 $ 0 $ 0 $ 0