Leases (Tables)

12 Months Ended

Dec. 31, 2020

Leases

Schedule of components of lease expense

	Year ended December 31,
(Millions)	2020		2019
Operating lease cost	$	348	$	308
Finance lease cost:
Amortization of assets		21		20
Interest on lease liabilities		1		2
Variable lease cost		101		93
Total net lease cost	$	471	$	423

Schedule of supplemental balance sheet information

	Location on Face of	As of December 31,
(Millions unless noted)	Balance Sheet	2020			2019
Operating leases:
Operating lease right of use assets	Operating lease right of use assets	$	864		$	858
Current operating lease liabilities	Operating lease liabilities - current	$	256		$	247
Noncurrent operating lease liabilities	Operating lease liabilities		609			607
Total operating lease liabilities		$	865		$	854
Finance leases:
Property and equipment, at cost	Property, plant and equipment	$	225		$	239
Accumulated amortization	Property, plant and equipment (accumulated depreciation)		(106)			(102)
Property and equipment, net		$	119		$	137
Current obligations of finance leases	Other current liabilities	$	22		$	21
Finance leases, net of current obligations	Other liabilities		93			111
Total finance lease liabilities		$	115		$	132
Weighted average remaining lease term (in years):
Operating leases			5.6			5.7
Finance leases			7.6			9.0
Weighted average discount rate:
Operating leases			2.4	%		3.2	%
Finance leases			3.5	%		3.8	%

Schedule of supplemental cash flow and other information

	Year Ended December 31,
(Millions)	2020		2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	326	$	309
Operating cash flows from finance leases		1		2
Financing cash flows from finance leases		58		18
Right of use assets obtained in exchange for lease liabilities:
Operating leases		250		326
Finance leases		18		61

Schedule of maturities of operating lease liabilities

	December 31, 2020
(Millions)	Finance Leases		Operating Leases
2021	$	20	$	273
2022		18		201
2023		18		141
2024		16		93
2025		10		60
After 2025		41		162
Total	$	123	$	930
Less: Amounts representing interest		8		65
Present value of future minimum lease payments		115		865
Less: Current obligations		22		256
Long-term obligations	$	93	$	609

Schedule of maturities of finance lease liabilities

	December 31, 2020
(Millions)	Finance Leases		Operating Leases
2021	$	20	$	273
2022		18		201
2023		18		141
2024		16		93
2025		10		60
After 2025		41		162
Total	$	123	$	930
Less: Amounts representing interest		8		65
Present value of future minimum lease payments		115		865
Less: Current obligations		22		256
Long-term obligations	$	93	$	609