Leases (Supplemental Balance Sheet Disclosure) (Details) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018
Assets
Right of use assets	[1]	$ 2,459	$ 0
Liabilities
Operating lease liabilities	[1]	604	0
Long-term operating lease liabilities	[1]	1,875	0
Total operating lease liabilities		$ 2,479
Weighted average remaining lease term (in years)		6 years 2 months 12 days
Weighted average discount rate		4.02%
Assets
Property, plant and equipment, gross		$ 64,623	61,213
Accumulated depreciation		19,008	16,155
Property, plant and equipment, net		45,615	45,058
Liabilities
Debt due within one year		711	544
Long-term debt		28,127	26,980
Total finance lease liabilities		698	$ 649
Finance Lease
Assets
Property, plant and equipment, gross		807
Accumulated depreciation		227
Property, plant and equipment, net		580
Liabilities
Debt due within one year		62
Long-term debt		636
Total finance lease liabilities		$ 698
Weighted average remaining lease term (in years)		11 years 10 months 24 days
Weighted average discount rate		6.50%

[1] We adopted ASU No. 2016-02, Leases (“ASC 842”), as of January 1, 2019. See Notes 3 and 25 for further information.