United Parcel Service, Inc. Quarterly report pursuant to Section 13 or 15(d)

Summary of Marketable Securities (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Marketable Securities, Amortized Cost Basis	$ 1,930	$ 992
Marketable Securities, Gross Unrealized Gain	7	2
Marketable Securities, Gross Unrealized Loss	2	2
Total Estimated Fair Value	1,935us-gaap_MarketableSecuritiesCurrent	992us-gaap_MarketableSecuritiesCurrent
Other debt and equity securities
Schedule of Available-for-sale Securities [Line Items]
Marketable Securities, Amortized Cost Basis	511	48
Marketable Securities, Gross Unrealized Gain	3	0
Marketable Securities, Gross Unrealized Loss	2	0
Total Estimated Fair Value	512	48
U.S. government and agency debt securities
Schedule of Available-for-sale Securities [Line Items]
Marketable Securities, Amortized Cost Basis	315	321
Marketable Securities, Gross Unrealized Gain	1	1
Marketable Securities, Gross Unrealized Loss	0	1
Total Estimated Fair Value	316	321
Mortgage and asset-backed debt securities
Schedule of Available-for-sale Securities [Line Items]
Marketable Securities, Amortized Cost Basis	88	89
Marketable Securities, Gross Unrealized Gain	1	1
Marketable Securities, Gross Unrealized Loss	0	1
Total Estimated Fair Value	89	89
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Marketable Securities, Amortized Cost Basis	1,016	534
Marketable Securities, Gross Unrealized Gain	2	0
Marketable Securities, Gross Unrealized Loss	0	0
Total Estimated Fair Value	$ 1,018	$ 534