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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Reconciliation of Pension Plan Assets Measured at Level 3 Fair Value (Details) - Fair Value, Inputs, Level 3 - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year (estimated) $ 546 $ 495
Net realized gains (losses) 131 36
Net change in unrealized gains (losses) (122) 50
Purchases 21 4
Sales (18) (3)
Issuances 39 48
Settlements (167) (84)
Transfers into Level 3 25 0
Transfers out of Level 3 0 0
Fair value of plan assets at end of year (estimated) 455 546
Hedge funds and related investments    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year (estimated) 3 5
Net realized gains (losses) (1) 0
Net change in unrealized gains (losses) 2 (2)
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Fair value of plan assets at end of year (estimated) 4 3
Private equity and related investments    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year (estimated) 52 65
Net realized gains (losses) (2) 1
Net change in unrealized gains (losses) (3) (15)
Purchases 21 4
Sales (18) (3)
Issuances 0 0
Settlements 0 0
Transfers into Level 3 25 0
Transfers out of Level 3 0 0
Fair value of plan assets at end of year (estimated) 75 52
Derivative instruments, net    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year (estimated) 491 425
Net realized gains (losses) 134 35
Net change in unrealized gains (losses) (121) 67
Purchases 0 0
Sales 0 0
Issuances 39 48
Settlements (167) (84)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Fair value of plan assets at end of year (estimated) $ 376 $ 491