RETIREMENT BENEFITS (Details 5) (USD $) In Millions, unless otherwise specified
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12 Months Ended |
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Dec. 31, 2013
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Dec. 31, 2012
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U.S. Pension Plans
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
100.00% |
100.00% |
U.S. Pension Plans | Equity securities
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
19.00% |
17.00% |
U.S. Pension Plans | Equity securities | Citigroup as investment issuer
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Defined Benefit Plan Disclosure |
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Citigroup common stock included in plan assets |
$ 0 |
$ 0 |
U.S. Pension Plans | Debt securities
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
42.00% |
45.00% |
U.S. Pension Plans | Real estate
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
5.00% |
5.00% |
U.S. Pension Plans | Private equity
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
11.00% |
11.00% |
U.S. Pension Plans | Other investments
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
23.00% |
22.00% |
U.S. Pension Plans | Minimum | Equity securities
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
0.00% |
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U.S. Pension Plans | Minimum | Debt securities
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
25.00% |
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U.S. Pension Plans | Minimum | Real estate
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
0.00% |
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U.S. Pension Plans | Minimum | Private equity
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
0.00% |
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U.S. Pension Plans | Minimum | Other investments
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
12.00% |
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U.S. Pension Plans | Maximum | Equity securities
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
30.00% |
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U.S. Pension Plans | Maximum | Debt securities
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
73.00% |
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U.S. Pension Plans | Maximum | Real estate
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
7.00% |
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U.S. Pension Plans | Maximum | Private equity
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
15.00% |
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U.S. Pension Plans | Maximum | Other investments
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
29.00% |
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Non - U.S. Pension Plans | Weighted Average
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
100.00% |
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Weighted-average asset allocation (as a percent) |
100.00% |
100.00% |
Non - U.S. Pension Plans | Weighted Average | Equity securities
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
19.00% |
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Weighted-average asset allocation (as a percent) |
20.00% |
16.00% |
Non - U.S. Pension Plans | Weighted Average | Debt securities
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
74.00% |
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Weighted-average asset allocation (as a percent) |
72.00% |
72.00% |
Non - U.S. Pension Plans | Weighted Average | Real estate
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
1.00% |
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Weighted-average asset allocation (as a percent) |
1.00% |
1.00% |
Non - U.S. Pension Plans | Weighted Average | Other investments
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
6.00% |
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Weighted-average asset allocation (as a percent) |
7.00% |
11.00% |
Non - U.S. Pension Plans | Minimum | Equity securities
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
0.00% |
0.00% |
Non - U.S. Pension Plans | Minimum | Debt securities
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
0.00% |
0.00% |
Non - U.S. Pension Plans | Minimum | Real estate
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
0.00% |
0.00% |
Non - U.S. Pension Plans | Minimum | Other investments
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
0.00% |
0.00% |
Non - U.S. Pension Plans | Maximum | Equity securities
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
69.00% |
63.00% |
Non - U.S. Pension Plans | Maximum | Debt securities
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
99.00% |
100.00% |
Non - U.S. Pension Plans | Maximum | Real estate
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
19.00% |
41.00% |
Non - U.S. Pension Plans | Maximum | Other investments
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
100.00% |
100.00% |
U.S. Postretirement Benefit Plans
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
100.00% |
100.00% |
U.S. Postretirement Benefit Plans | Equity securities
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
19.00% |
17.00% |
U.S. Postretirement Benefit Plans | Debt securities
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
42.00% |
45.00% |
U.S. Postretirement Benefit Plans | Real estate
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
5.00% |
5.00% |
U.S. Postretirement Benefit Plans | Private equity
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
11.00% |
11.00% |
U.S. Postretirement Benefit Plans | Other investments
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
23.00% |
22.00% |
U.S. Postretirement Benefit Plans | Minimum | Equity securities
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
0.00% |
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U.S. Postretirement Benefit Plans | Minimum | Debt securities
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
25.00% |
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U.S. Postretirement Benefit Plans | Minimum | Real estate
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
0.00% |
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U.S. Postretirement Benefit Plans | Minimum | Private equity
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|
Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
0.00% |
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U.S. Postretirement Benefit Plans | Minimum | Other investments
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
12.00% |
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U.S. Postretirement Benefit Plans | Maximum | Equity securities
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
30.00% |
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U.S. Postretirement Benefit Plans | Maximum | Debt securities
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
73.00% |
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U.S. Postretirement Benefit Plans | Maximum | Real estate
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
7.00% |
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U.S. Postretirement Benefit Plans | Maximum | Private equity
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
15.00% |
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U.S. Postretirement Benefit Plans | Maximum | Other investments
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
29.00% |
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Non-U.S. Postretirement Benefit Plans | Weighted Average
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
100.00% |
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Weighted-average asset allocation (as a percent) |
100.00% |
100.00% |
Non-U.S. Postretirement Benefit Plans | Weighted Average | Equity securities
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
42.00% |
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Weighted-average asset allocation (as a percent) |
41.00% |
28.00% |
Non-U.S. Postretirement Benefit Plans | Weighted Average | Debt securities
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
52.00% |
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Weighted-average asset allocation (as a percent) |
51.00% |
46.00% |
Non-U.S. Postretirement Benefit Plans | Weighted Average | Other investments
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Defined Benefit Plan Disclosure |
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Target asset allocation (as a percent) |
6.00% |
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Weighted-average asset allocation (as a percent) |
8.00% |
26.00% |
Non-U.S. Postretirement Benefit Plans | Minimum | Equity securities
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
0.00% |
0.00% |
Non-U.S. Postretirement Benefit Plans | Minimum | Debt securities
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
51.00% |
46.00% |
Non-U.S. Postretirement Benefit Plans | Minimum | Other investments
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
0.00% |
0.00% |
Non-U.S. Postretirement Benefit Plans | Maximum | Equity securities
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
41.00% |
28.00% |
Non-U.S. Postretirement Benefit Plans | Maximum | Debt securities
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
100.00% |
100.00% |
Non-U.S. Postretirement Benefit Plans | Maximum | Other investments
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Defined Benefit Plan Disclosure |
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Weighted-average asset allocation (as a percent) |
8.00% |
26.00% |