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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, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year (estimated) $ 557 $ 455
Net realized gains (losses) 238 (16)
Net change in unrealized gains (losses) (188) 110
Purchases 5 14
Sales (2) (1)
Settlements (237) (13)
Transfers into Level 3 18 25
Transfers out of Level 3 (61) (17)
Fair value of plan assets at end of year (estimated) 330 557
Hedge funds and related investments    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year (estimated) 10 4
Net realized gains (losses) 0 (1)
Net change in unrealized gains (losses) 1 2
Purchases 0 0
Sales 0 (1)
Settlements 0 0
Transfers into Level 3 0 6
Transfers out of Level 3 (8) 0
Fair value of plan assets at end of year (estimated) 3 10
Private equity and related investments    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year (estimated) 102 75
Net realized gains (losses) 0 (30)
Net change in unrealized gains (losses) (5) 41
Purchases 5 14
Sales (2) 0
Settlements 0 0
Transfers into Level 3 18 19
Transfers out of Level 3 (53) (17)
Fair value of plan assets at end of year (estimated) 65 102
Derivative instruments, net    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year (estimated) 445 376
Net realized gains (losses) 238 15
Net change in unrealized gains (losses) (184) 67
Purchases 0 0
Sales 0 0
Settlements (237) (13)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Fair value of plan assets at end of year (estimated) $ 262 $ 445