Shareholders' equity AOCI Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Equity, Class of Treasury Stock [Line Items]
Interest expense	$ 182	$ 165	$ 360	$ 325
Income Tax (Expense) Benefit	(490)	(392)	(832)	(776)
Net income (loss)	2,230	1,793	4,373	3,685
Reclassification out of Accumulated Other Comprehensive Income
Equity, Class of Treasury Stock [Line Items]
Net income (loss)	7	(82)	(130)	(229)
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	5	(107)	(114)	(287)
Income Tax (Expense) Benefit	12	16	(24)	(34)
Net income (loss)	17	(91)	(90)	(253)
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	(12)	11	(49)	31
Interest expense	(4)	(4)	(8)	(8)
Income Tax (Expense) Benefit	3	2	(12)	5
Net income (loss)	(13)	5	(45)	18
Cumulative Foreign Currency Translation Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income
Equity, Class of Treasury Stock [Line Items]
Interest expense	3	4	6	7
Income Tax (Expense) Benefit	0	0	1	1
Net income (loss)	$ 3	$ 4	$ 5	$ 6