Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 801	$ 2,054
Accounts receivable, net of allowances of $62 and $65, respectively	3,171	2,886
Other current assets	492	430
Total current assets	4,464	5,370
Long-term assets
Property and equipment, net of $2,783 and $2,568 in accumulated depreciation, respectively	2,627	2,661
Operating lease assets	2,601	2,278
Goodwill	4,572	4,599
Identifiable intangible assets, net of $981 and $909 in accumulated amortization, respectively	923	974
Other long-term assets	377	287
Total long-term assets	11,100	10,799
Total assets	15,564	16,169
Current liabilities
Accounts payable	1,293	1,255
Accrued expenses	2,117	1,814
Short-term borrowings and current maturities of long-term debt	92	1,338
Short-term operating lease liabilities	584	483
Other current liabilities	291	263
Total current liabilities	4,377	5,153
Long-term debt	5,181	5,369
Deferred tax liability	380	371
Employee benefit obligations	167	192
Long-term operating lease liabilities	2,042	1,795
Other long-term liabilities	450	440
Total long-term liabilities	8,220	8,167
Stockholders’ equity
Convertible perpetual preferred stock, $0.001 par value; 10 shares authorized; — and 0.001 of Series A shares issued and outstanding as of June 30, 2021 and December 31, 2020, respectively	0	1
Common stock, $0.001 par value; 300 shares authorized; 112 and 102 shares issued and outstanding as of June 30, 2021 and December 31, 2020, respectively	0	0
Additional paid-in capital	1,971	1,998
Retained earnings	1,139	868
Accumulated other comprehensive loss	(183)	(158)
Total stockholders’ equity before noncontrolling interests	2,927	2,709
Noncontrolling interests	40	140
Total equity	2,967	2,849
Total liabilities and equity	$ 15,564	$ 16,169