Shareholders' equity AOCI Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Equity, Class of Treasury Stock [Line Items]
Foreign Currency Transaction Gain (Loss), Realized			$ 32
Income tax expense	$ 265	$ 218	913	$ 873
Net income (loss)	812	1,833	4,001	6,398
Reclassification out of Accumulated Other Comprehensive Income
Equity, Class of Treasury Stock [Line Items]
Net income (loss)	(265)	(7)	(744)	31
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	(279)	(10)	(857)	26
Income tax expense	39	3	138	5
Net income (loss)	(240)	(7)	(719)	31
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	(32)	0	(32)	0
Income tax expense	7	0	7	0
Net income (loss)	$ (25)	$ 0	$ (25)	$ 0