Consolidated Statement of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows From Operating Activities
Net Income		$ 3,377	$ 5,873	$ 5,248
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization		1,341	1,356	1,318
Impairments		861	8	24
Accretion on discounted liabilities		23	23	22
Deferred income taxes		183	252	(1,886)
Undistributed equity earnings		(143)	221	(516)
Net gain on dispositions		(20)	(19)	(15)
Gain on consolidation of business		0	0	(423)
Other		16	132	(186)
Working capital adjustments
Accounts and notes receivable		(2,308)	1,320	(1,182)
Inventories		(204)	(202)	(176)
Prepaid expenses and other current assets		(14)	(113)	104
Accounts payable		1,941	(1,546)	1,153
Taxes and other accruals		(245)	268	163
Net Cash Provided by Operating Activities		4,808	7,573	3,648
Cash Flows From Investing Activities
Capital expenditures and investments		(3,873)	(2,639)	(1,832)
Proceeds from asset dispositions	[1]	157	57	86
Advances/loans—related parties		(98)	(1)	(10)
Collection of advances/loans—related parties		95	0	326
Restricted cash received from consolidation of business		0	0	318
Other		31	112	(34)
Net Cash Provided by (Used in) Investing Activities		(3,688)	(2,471)	(1,146)
Cash Flows From Financing Activities
Issuance of debt		1,783	2,184	3,508
Repayment of debt		(1,307)	(1,144)	(3,678)
Issuance of common stock		32	39	35
Repurchase of common stock		(1,650)	(4,645)	(1,590)
Dividends paid on common stock		(1,570)	(1,436)	(1,395)
Distributions to noncontrolling interests		(241)	(207)	(120)
Net proceeds from issuance of Phillips 66 Partners LP common and preferred units		173	128	1,205
Other		269	(86)	(76)
Net Cash Provided by (Used in) Financing Activities		(2,511)	(5,167)	(2,111)
Effect of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash		(14)	(35)	17
Net Change in Cash, Cash Equivalents and Restricted Cash		(1,405)	(100)	408
Cash, cash equivalents and restricted cash at beginning of year		3,019	3,119	2,711
Cash, Cash Equivalents and Restricted Cash at End of Year		$ 1,614	$ 3,019	$ 3,119

[1] Includes return of investments in equity affiliates.