Shareholders' equity AOCI Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Equity, Class of Treasury Stock [Line Items]
Interest expense	$ 178	$ 160
Income Tax (Expense) Benefit	(342)	(384)
Net income (loss)	2,143	1,892
Reclassification out of Accumulated Other Comprehensive Income
Equity, Class of Treasury Stock [Line Items]
Net income (loss)	(137)	(147)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income
Equity, Class of Treasury Stock [Line Items]
Debt Securities, Available-for-sale, Realized Gain	(119)	(180)
Income Tax (Expense) Benefit	(12)	(18)
Net income (loss)	(107)	(162)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Reclassification out of Accumulated Other Comprehensive Income
Equity, Class of Treasury Stock [Line Items]
Foreign Currency Transaction Gain (Loss), Realized	(37)	20
Interest expense	(4)	(4)
Income Tax (Expense) Benefit	(9)	3
Net income (loss)	(32)	13
Cumulative Foreign Currency Translation Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income
Equity, Class of Treasury Stock [Line Items]
Interest expense	3	3
Income Tax (Expense) Benefit	1	1
Net income (loss)	$ 2	$ 2