Shareholders' Equity (Details) - USD ($)	3 Months Ended				6 Months Ended		87 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Feb. 28, 2017	Nov. 30, 2014	Apr. 30, 2012
Common Stock Programs
Shares purchased (in shares)							124,600,000
Total cost of shares purchased	$ 1,056,000,000	$ 101,000,000	$ 402,000,000	$ 553,000,000			$ 12,200,000,000
Weighted average shares outstanding
Basic weighted average ordinary shares outstanding (in shares)	240,600,000		246,000,000.0		241,400,000	247,200,000
Dilutive effect of potentially issuable shares (in shares)	2,200,000		1,400,000		1,800,000	1,600,000
Diluted weighted average ordinary shares outstanding (in shares)	242,800,000		247,400,000		243,200,000	248,800,000
Number of shares excluded from the calculation of diluted earnings per share (in shares)	0		0		0	0
Share Repurchase Program of 2014
Common Stock Programs
Share repurchase authorization limit (up to)	$ 15,000,000,000.0				$ 15,000,000,000.0		15,000,000,000.0	$ 5,000,000,000.0	$ 5,000,000,000.0
Share repurchase, remaining authorization limit (in shares)	$ 2,800,000,000				$ 2,800,000,000		$ 2,800,000,000
2012 - Share Repurchase Program
Common Stock Programs
Share repurchase authorization limit (up to)										$ 5,000,000,000.0
Shares purchased (in shares)	5,800,000		2,800,000		6,400,000	6,700,000
Total cost of shares purchased	$ 1,050,000,000		$ 400,000,000		$ 1,150,000,000	$ 950,000,000