Reclassifications From Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 22, 2021
Reclassifications from accumulated other comprehensive (loss) income
Other income (expense), net	$ 208	$ 51
Tax (benefit)	43	33
Reclassifications, after tax	(114)	(538)
Interest Expense	202	35
5.95 Notes and Debentures Due March 15, 2022
Reclassifications from accumulated other comprehensive (loss) income
Debt Instrument, Interest Rate, Stated Percentage			5.95%
Reclassification out of Accumulated Other Comprehensive Income | Actuarial losses, net
Reclassifications from accumulated other comprehensive (loss) income
Other income (expense), net	7	7
Tax (benefit)	(2)	(2)
Reclassifications, after tax	5	5
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Reclassifications from accumulated other comprehensive (loss) income
Tax (benefit)	5	0
Reclassifications, after tax	(7)	0
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Interest Rate Swap
Reclassifications from accumulated other comprehensive (loss) income
Interest Expense	$ 2	$ 0