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Changes in Accumulated Other Comprehensive Income / (Loss) - Schedule of Accumulated Other Comprehensive Income / (Loss) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Class of Stock [Line Items]    
Unrealized Gains and Losses on Available-for-Sale Debt securities Beginning balance $ 10,044  
Total, Beginning balance (1,483)  
Unrealized Gains and Losses on Available-for-Sale Debt securities, Ending balance 9,500  
Total, Ending balance (1,669)  
Gains and losses on Cash Flow Hedges [Member]    
Class of Stock [Line Items]    
Gains and losses on Cash Flow Hedges, Beginning balance (6) $ 22
Other comprehensive income / (loss) before reclassifications 23 (60)
Amounts reclassified from accumulated other comprehensive income (14) 43
Net current period other comprehensive income / (loss) 9 (17)
Gains and losses on Cash Flow Hedges, Ending balance 3 5
Unrealized Gains and Losses on Available-for- Sale Debt securities [Member]    
Class of Stock [Line Items]    
Unrealized Gains and Losses on Available-for-Sale Debt securities Beginning balance (1) (6)
Other comprehensive income / (loss) before reclassifications (1) 1
Amounts reclassified from accumulated other comprehensive income 0 0
Net current period other comprehensive income / (loss) (1) 1
Unrealized Gains and Losses on Available-for-Sale Debt securities, Ending balance (2) (5)
Foreign Currency Items [Member]    
Class of Stock [Line Items]    
Foreign Currency Items, Beginning balance (1,476) (1,798)
Other comprehensive income / (loss) before reclassifications (194) 155
Amounts reclassified from accumulated other comprehensive income 0 0
Net current period other comprehensive income / (loss) (194) 155
Foreign Currency Items, Ending balance (1,670) (1,643)
Total Accumulated Other Comprehensive Income (Loss) [Member]    
Class of Stock [Line Items]    
Total, Beginning balance (1,483) (1,782)
Other comprehensive income / (loss) before reclassifications (172) 96
Amounts reclassified from accumulated other comprehensive income (14) 43
Net current period other comprehensive income / (loss) (186) 139
Total, Ending balance $ (1,669) $ (1,643)