Shareholders' equity AOCI Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Equity, Class of Treasury Stock [Line Items]
Interest expense	$ 160	$ 132
Income Tax (Expense) Benefit	(384)	(353)
Net income (loss)	1,892	1,953
Reclassification out of Accumulated Other Comprehensive Income
Equity, Class of Treasury Stock [Line Items]
Net income (loss)	(147)	(114)
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	(180)	(136)
Income Tax (Expense) Benefit	18	22
Net income (loss)	(162)	(114)
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	20	0
Interest expense	(4)	0
Income Tax (Expense) Benefit	(3)	0
Net income (loss)	13	0
Cumulative Foreign Currency Translation Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income
Equity, Class of Treasury Stock [Line Items]
Interest expense	3	0
Income Tax (Expense) Benefit	(1)	0
Net income (loss)	$ 2	$ 0