Reclassifications From Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reclassifications from accumulated other comprehensive (loss) income
Other income (expense), net	$ 37	$ 44	$ 88	$ 88
Tax (benefit)	82	80	115	115
Reclassifications, after tax	(234)	(252)	(772)	(379)
Interest Expense	35	41	70	80
Reclassification out of Accumulated Other Comprehensive Income | Actuarial losses, net
Reclassifications from accumulated other comprehensive (loss) income
Other income (expense), net	6	6	13	11
Tax (benefit)	(1)	(2)	(3)	(3)
Reclassifications, after tax	5	4	10	8
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)	0	0	0	0
Reclassifications, after tax	(1)	(1)	(1)	(1)
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	$ 1	$ 1	$ 1	$ 1