Fair Value Measurements And Disclosure (Notional Amount Of Our Outstanding Derivative Positions) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Notional amounts of outstanding derivative positions	$ 40,275	$ 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	37,908	38,213
Foreign exchange contracts
Derivative [Line Items]
Notional amounts of outstanding derivative positions	$ 617	$ 617