Merger Transaction Fair Value of Consideration Transferred (Details) $ / shares in Units, $ in Millions	Sep. 02, 2016 USD ($) $ / shares shares
Business Combinations [Abstract]
Acquiror Closing Share Price | $ / shares	$ 45.45
Business Combination, Number of Acquiree Shares Outstanding Prior to Acquisition | shares	427,181,743
Total fair value of consideration transferred	$ 19,671
Business Combination, Consideration Transferred, Fair Value of Acquiree Equity Awards	224
Fair Value of Acquiree Equity Awards not Earned as of Merger Date	$ 101
Tyco share consolidation ratio	0.955
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares	407,958,565
Business Acquisition, Share Price | $ / shares	$ 47.67	[1]
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 19,447
Acquiror Market Capitalization at Merger Date	29,012
Cash consideration paid to JCI Inc. shareholders	$ 3,864
Business Combination, Reduction in Number of Acquiror Shares due to Cash Consideration Paid by Acquiree | shares	110,800,000
Business Combination, Consideration Transferred per Share For Cash Election | $ / shares	$ 34.88

[1] (1)Amount equals JCI Inc. closing share price and market capitalization at September 2, 2016 ($45.45 and $29,012 million, respectively) adjusted for the Tyco $3,864 million cash contribution used to purchase 110.8 million shares of JCI Inc. common stock for $34.88 per share.