Venezuela (Details) $ / shares in Units, $ in Millions		3 Months Ended					12 Months Ended
		Dec. 31, 2015 USD ($) VEF / $	Sep. 30, 2015 USD ($) VEF / $	Jun. 30, 2015 USD ($) VEF / $	Sep. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) VEF / $ $ / shares	Dec. 31, 2014 USD ($) VEF / $ $ / shares	Dec. 31, 2013 USD ($) VEF / $ $ / shares	Mar. 31, 2015 VEF / $	Mar. 31, 2013 VEF / $	Dec. 31, 2012 VEF / $
Foreign Currency [Line Items]
Pretax Charge for Venezuela Accounting Change							$ 1,084	$ 0	$ 0
Charge for Venezuela Accounting Change - Portion Related to Reclassification of Cumulative Translation Losses	[1]						(111)	0	0
CP Venezuela [Member]
Foreign Currency [Line Items]
Aftertax Charge for Venezuela Accounting Change		$ 1,058					1,058
Pretax Charge for Venezuela Accounting Change							$ 1,084
Aftertax Charge for Venezuela Accounting Change Per Common Share Diluted | $ / shares							$ 1.16
Charge for Venezuela Accounting Change - Portion Related to Investment in CP Venezuela							$ 952
Charge for Venezuela Accounting Change - Portion Related to Reclassification of Cumulative Translation Losses							111
Pretax Remeasurement Charge							34	327	172
Aftertax Remeasurement Charge			$ 12	$ 10	$ 40	$ 174	$ 22	$ 214	$ 111
Impact of Aftertax Remeasurement Charge Per Common Share, Diluted | $ / shares							$ 0.02	$ 0.23	$ 0.12
VENEZUELA
Foreign Currency [Line Items]
Official Exchange Rate | VEF / $		6.30					6.30		6.30		6.30	4.30
SIMADI Exchange Rate | VEF / $		198.70					198.70
SICAD Exchange Rate | VEF / $		13.50	13.50	12.80			13.50	12.00		12.00

[1] Represents reclassifications from Accumulated other comprehensive income (loss) due to the change in accounting for the Company’s Venezuelan operations. Cumulative translation, net actuarial gain (loss) and unrealized gains (losses) on available-for-sale securities were reclassified into the Charge for Venezuela accounting change on the Consolidated Statement of Income. See Note 14, Venezuela for additional details.