(Pension Benefit Adjustments Recognized In Other Comprehensive (Loss) Income) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial (gain) loss	$ (352)
Amortization of actuarial (loss) gain	(202)
Current year prior service cost	42
Amortization of prior service cost	(20)
Total recognized in other comprehensive income	(532)
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial (gain) loss	6
Amortization of actuarial (loss) gain	(2)
Amortization of prior service cost	0
Effect of foreign currency exchange rate movements	4
Total recognized in other comprehensive income	$ 8