Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other net periodic benefit (costs) credits	$ 16	$ 5	$ (1)
Net interest and other	(188)	(188)	(256)
Provision (benefit) for income taxes	167	58	(14)
Net income (loss)	3,612	946	$ (1,451)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net income (loss)	13	(22)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other net periodic benefit (costs) credits	22	22
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other net periodic benefit (costs) credits	(4)	(7)
Reclassification out of Accumulated Other Comprehensive Income | Net settlement loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other net periodic benefit (costs) credits	(2)	(9)
Reclassification out of Accumulated Other Comprehensive Income | Reclassification of de-designated forward interest rate swaps
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net interest and other	0	(28)
Provision (benefit) for income taxes	$ (3)	$ 0