Shareholders' equity AOCI Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Equity, Class of Treasury Stock [Line Items]
Interest expense	$ 165	$ 134	$ 325	$ 266
Income Tax (Expense) Benefit	(392)	(291)	(776)	(644)
Net income (loss)	1,793	1,190	3,685	3,143
Reclassification out of Accumulated Other Comprehensive Income
Equity, Class of Treasury Stock [Line Items]
Net income (loss)	(82)	(365)	(229)	(479)
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	(107)	(442)	(287)	(578)
Income Tax (Expense) Benefit	16	77	(34)	(99)
Net income (loss)	(91)	(365)	(253)	(479)
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	11	0	31	0
Interest expense	(4)	0	(8)	0
Income Tax (Expense) Benefit	(2)	0	5	0
Net income (loss)	5	0	18	0
Cumulative Foreign Currency Translation Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income
Equity, Class of Treasury Stock [Line Items]
Interest expense	4	0	7	0
Income Tax (Expense) Benefit	0	0	1	0
Net income (loss)	$ 4	$ 0	$ 6	$ 0