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Fair Value Measurements - Summary of Gains and Losses (Realized and Unrealized) Relating to Level 3 Assets and Liabilities Included in Earnings (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2018
Variable Interest Entity, Primary Beneficiary [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Total gains or losses included in earnings for the period     $ 179   $ 335
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held     179   335
Net Investment Income [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Total gains or losses included in earnings for the period $ 0 $ 0 1 $ 1  
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held 0 0 0   0
Interest Rate Swap [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held     22   18
Gain (Loss) on Derivative Instruments [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Total gains or losses included in earnings for the period 11 10 23 $ 19  
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held 10 10      
Income Loss On Variable Interest Entities [Member] | Variable Interest Entity, Primary Beneficiary [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Total gains or losses included in earnings for the period 61 183      
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held 61 183      
Other Income or (Loss) [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Total gains or losses included in earnings for the period 0 0 (1)   (1)
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held $ 0 $ 0 $ (1)   $ (1)