Shareholders' equity AOCI Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Equity, Class of Treasury Stock [Line Items]
Interest expense	$ 192	$ 174	$ 552	$ 499
Income Tax (Expense) Benefit	(504)	(413)	(1,336)	(1,189)
Net income (loss)	2,324	2,043	6,697	5,728
Reclassification out of Accumulated Other Comprehensive Income
Equity, Class of Treasury Stock [Line Items]
Net income (loss)	29	(86)	(101)	(315)
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	(40)	(70)	(154)	(357)
Income Tax (Expense) Benefit	17	25	(41)	(59)
Net income (loss)	(23)	(45)	(113)	(298)
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	63	(51)	14	(20)
Interest expense	(3)	(4)	(11)	(12)
Income Tax (Expense) Benefit	(12)	(12)	0	(7)
Net income (loss)	48	(43)	3	(25)
Cumulative Foreign Currency Translation Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income
Equity, Class of Treasury Stock [Line Items]
Interest expense	5	3	11	10
Income Tax (Expense) Benefit	(1)	1	2	2
Net income (loss)	$ 4	$ 2	$ 9	$ 8