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Pension and Other Postretirement Benefit Plans (Fair Value of Plan Assets by Category) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 3,293 $ 3,682
Cash and cash equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 26 29
US Government Debt Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 494 579
Foreign Government Debt Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 212 253
Domestic Corporate Debt Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 909 1,000
Foreign Corporate Debt Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 160 321
U.S. Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 13 12
Foreign Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 472 427
Money Market Funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 59 67
Common and Collective Funds, U.S. equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 648 651
Common and Collective Funds, International equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 65 66
Common and Collective Funds, Short-term investment fund    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 55 63
Limited Partnership, U.S. Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 120 140
Limited Partnerships, Diversified fund of funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 21 32
Limited Partnerships, Emerging growth    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 15 23
Real Estate    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 10 10
All other investments    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 14 9
Fair Value, Inputs, Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 570 535
Fair Value, Inputs, Level 1 | Cash and cash equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 26 29
Fair Value, Inputs, Level 1 | US Government Debt Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 1 | Foreign Government Debt Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 1 | Domestic Corporate Debt Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 1 | Foreign Corporate Debt Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 1 | U.S. Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 13 12
Fair Value, Inputs, Level 1 | Foreign Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 472 427
Fair Value, Inputs, Level 1 | Money Market Funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 59 67
Fair Value, Inputs, Level 1 | Common and Collective Funds, U.S. equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 1 | Common and Collective Funds, International equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 1 | Common and Collective Funds, Short-term investment fund    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 1 | Limited Partnership, U.S. Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 1 | Limited Partnerships, Diversified fund of funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 1 | Limited Partnerships, Emerging growth    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 1 | Real Estate    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 1 | All other investments    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2,567 2,952
Fair Value, Inputs, Level 2 | Cash and cash equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 2 | US Government Debt Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 494 579
Fair Value, Inputs, Level 2 | Foreign Government Debt Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 212 253
Fair Value, Inputs, Level 2 | Domestic Corporate Debt Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 909 1,000
Fair Value, Inputs, Level 2 | Foreign Corporate Debt Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 160 321
Fair Value, Inputs, Level 2 | U.S. Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 2 | Foreign Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 2 | Money Market Funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 2 | Common and Collective Funds, U.S. equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 648 651
Fair Value, Inputs, Level 2 | Common and Collective Funds, International equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 65 66
Fair Value, Inputs, Level 2 | Common and Collective Funds, Short-term investment fund    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 55 63
Fair Value, Inputs, Level 2 | Limited Partnership, U.S. Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 2 | Limited Partnerships, Diversified fund of funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 2 | Limited Partnerships, Emerging growth    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 2 | Real Estate    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 10 10
Fair Value, Inputs, Level 2 | All other investments    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 14 9
Fair Value, Inputs, Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 156 195
Fair Value, Inputs, Level 3 | Cash and cash equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | US Government Debt Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Foreign Government Debt Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Domestic Corporate Debt Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Foreign Corporate Debt Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | U.S. Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Foreign Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Money Market Funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Common and Collective Funds, U.S. equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Common and Collective Funds, International equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Common and Collective Funds, Short-term investment fund    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | Limited Partnership, U.S. Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 120 140
Fair Value, Inputs, Level 3 | Limited Partnerships, Diversified fund of funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 21 32
Fair Value, Inputs, Level 3 | Limited Partnerships, Emerging growth    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 15 23
Fair Value, Inputs, Level 3 | Real Estate    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Fair Value, Inputs, Level 3 | All other investments    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 0 $ 0