United Parcel Service, Inc. Annual report pursuant to Section 13 and 15(d)

COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Fair Value Measurement of Plan Assets Using Unobservable Inputs (Detail)

COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Fair Value Measurement of Plan Assets Using Unobservable Inputs (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Actual Return on Assets:
Fair value of plan assets at end of year	$ 30,129	$ 27,510
Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	7,260	6,833
Actual Return on Assets:
Assets Held at End of Year	245	287
Assets Sold During the Year	140	266
Purchases	2,402	2,130
Sales	(2,070)	(2,256)
Transfers Into (Out of) Level 3	0	0
Fair value of plan assets at end of year	7,977	7,260
Fair Value, Inputs, Level 3 \| Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	223	138
Actual Return on Assets:
Assets Held at End of Year	0	(1)
Assets Sold During the Year	0	0
Purchases	108	165
Sales	(62)	(79)
Transfers Into (Out of) Level 3	0	0
Fair value of plan assets at end of year	269	223
Fair Value, Inputs, Level 3 \| Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	3,738	2,829
Actual Return on Assets:
Assets Held at End of Year	71	229
Assets Sold During the Year	(9)	5
Purchases	1,043	1,676
Sales	(1,248)	(1,001)
Transfers Into (Out of) Level 3	0	0
Fair value of plan assets at end of year	3,595	3,738
Fair Value, Inputs, Level 3 \| Structured Products(1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	1,091	1,039
Actual Return on Assets:
Assets Held at End of Year	104	81
Assets Sold During the Year	23	54
Purchases	350	145
Sales	(261)	(228)
Transfers Into (Out of) Level 3	0	0
Fair value of plan assets at end of year	1,307	1,091
Fair Value, Inputs, Level 3 \| Private Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	1,397	1,416
Actual Return on Assets:
Assets Held at End of Year	11	71
Assets Sold During the Year	126	153
Purchases	166	143
Sales	(377)	(386)
Transfers Into (Out of) Level 3	0	0
Fair value of plan assets at end of year	1,323	1,397
Fair Value, Inputs, Level 3 \| All Other Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	0	0
Actual Return on Assets:
Assets Held at End of Year	0	0
Assets Sold During the Year	0	0
Purchases	735	0
Sales	(122)	0
Transfers Into (Out of) Level 3	0	0
Fair value of plan assets at end of year	613	0
Fair Value, Inputs, Level 3 \| Risk Parity Funds [Domain]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	756	1,362
Actual Return on Assets:
Assets Held at End of Year	61	(99)
Assets Sold During the Year	0	54
Purchases	0	1
Sales	0	(562)
Transfers Into (Out of) Level 3	0	0
Fair value of plan assets at end of year	817	756
Fair Value, Inputs, Level 3 \| Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	55	49
Actual Return on Assets:
Assets Held at End of Year	(2)	6
Fair value of plan assets at end of year	$ 53	$ 55