Fair Value Measurements And Disclosure (Notional Amount Of Our Outstanding Derivative Positions) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Notional amounts of outstanding derivative positions	$ 39,367	$ 38,830
Interest rate swaps
Derivative [Line Items]
Notional amounts of outstanding derivative positions	1,750	0
Cross-currency swaps
Derivative [Line Items]
Notional amounts of outstanding derivative positions	37,617	38,213
Foreign exchange contracts
Derivative [Line Items]
Notional amounts of outstanding derivative positions	$ 0	$ 617