Contract Assets and Liabilities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Increase in contract assets	$ 700
Increase in contract liabilities	400
Revenue recognized related to contract liabilities outstanding at the beginning of the year	3,000	$ 2,600
Allowance for expected credit losses on contract assets	$ 510		$ 491