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Derivatives - Cash Flow Hedges (Details) - Cash flow hedge - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivatives in Cash Flow Hedging Relationships
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges	$ 13		$ 13
After-tax net unrealized gain (loss) anticipated to be reclassified from AOCI to the income statement within next twelve months			84
Pretax Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivative	66	$ 173	144	$ 307
Interest rate swap and treasury lock in aggregate
Derivatives in Cash Flow Hedging Relationships
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges	(89)		(89)
Foreign currency forward/option contracts
Derivatives in Cash Flow Hedging Relationships
Pretax Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivative	66	173	144	307
Interest rate contracts
Derivatives in Cash Flow Hedging Relationships
Pretax Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivative	$ 0	$ 0	$ 0	$ 0