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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Reconciliation of Pension Plan Assets (Details) - Fair Value, Inputs, Level 3 - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, beginning $ 4,840 $ 4,935
Net realized gains (losses) 253 322
Net change in unrealized appreciation (depreciation) (81) (58)
Purchases 588 723
Sales (841) (927)
Issuances 47 52
Settlements (84) (132)
Transfers, Out(1) 0 (75)
Fair value of plan assets, ending 4,722 4,840
Hedge funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, beginning 3,333 3,225
Net realized gains (losses) 143 186
Net change in unrealized appreciation (depreciation) 47 76
Purchases 441 541
Sales (539) (540)
Issuances 47 52
Settlements (84) (132)
Transfers, Out(1) 0 (75)
Fair value of plan assets, ending 3,388 3,333
Private equity and related funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, beginning 1,422 1,606
Net realized gains (losses) 100 128
Net change in unrealized appreciation (depreciation) (117) (130)
Purchases 141 177
Sales (279) (359)
Issuances 0 0
Settlements 0 0
Transfers, Out(1) 0 0
Fair value of plan assets, ending 1,267 1,422
Real estate and related funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, beginning 82 101
Net realized gains (losses) 9 8
Net change in unrealized appreciation (depreciation) (11) (4)
Purchases 6 5
Sales (19) (28)
Issuances 0 0
Settlements 0 0
Transfers, Out(1) 0 0
Fair value of plan assets, ending 67 82
Fixed income    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, beginning 3 3
Net realized gains (losses) 1 0
Net change in unrealized appreciation (depreciation) 0 0
Purchases 0 0
Sales (4) 0
Issuances 0 0
Settlements 0 0
Transfers, Out(1) 0 0
Fair value of plan assets, ending $ 0 $ 3