Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows From Operating Activities
Net Income	$ 5,873	$ 5,248	$ 1,644
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	1,356	1,318	1,168
Impairments	8	24	5
Accretion on discounted liabilities	23	22	21
Deferred income taxes	252	(1,886)	612
Undistributed equity earnings	221	(516)	(815)
Net gain on dispositions	(19)	(15)	(10)
Gain on consolidation of business	0	(423)	0
Other	132	(186)	(163)
Working capital adjustments
Accounts and notes receivable	1,320	(1,182)	(1,258)
Inventories	(202)	(176)	216
Prepaid expenses and other current assets	(113)	104	(147)
Accounts payable	(1,546)	1,153	1,579
Taxes and other accruals	268	163	111
Net Cash Provided by Operating Activities	7,573	3,648	2,963
Cash Flows From Investing Activities
Capital expenditures and investments	(2,639)	(1,832)	(2,844)
Proceeds from asset dispositions	57	86	156
Advances/loans—related parties	(1)	(10)	(432)
Collection of advances/loans—related parties	0	326	108
Restricted cash received from consolidation of business	0	318	0
Other	112	(34)	(146)
Net Cash Used in Investing Activities	(2,471)	(1,146)	(3,158)
Cash Flows From Financing Activities
Issuance of debt	2,184	3,508	2,090
Repayment of debt	(1,144)	(3,678)	(833)
Issuance of common stock	39	35	34
Repurchase of common stock	(4,645)	(1,590)	(1,042)
Dividends paid on common stock	(1,436)	(1,395)	(1,282)
Distributions to noncontrolling interests	(207)	(120)	(75)
Net proceeds from issuance of Phillips 66 Partners LP common and preferred units	128	1,205	972
Other	(86)	(76)	(42)
Net Cash Used in Financing Activities	(5,167)	(2,111)	(178)
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash	(35)	17	10
Net Change in Cash, Cash Equivalents and Restricted Cash	(100)	408	(363)
Cash, cash equivalents and restricted cash at beginning of period	3,119	2,711	3,074
Cash, Cash Equivalents and Restricted Cash at End of Period	$ 3,019	$ 3,119	$ 2,711