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Pension and Other Postretirement Plan Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets $ 3,355 $ 2,975 $ 2,562
Pension Benefits | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 1,173 1,135  
Pension Benefits | Fixed-Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 1,298 1,109  
Pension Benefits | Alternatives      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 586 527  
Pension Benefits | Other Investments      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 298 204  
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 55 56 57
Other Postretirement Benefits | Deposit Administration Fund      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 55 56  
Level 1 | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 277 291  
Level 1 | Pension Benefits | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 230 254  
Level 1 | Pension Benefits | Other Investments      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 47 37  
Level 2 | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 1,003 1,069  
Level 2 | Pension Benefits | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 111 135  
Level 2 | Pension Benefits | Fixed-Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 824 877  
Level 2 | Pension Benefits | Alternatives      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets   1  
Level 2 | Pension Benefits | Other Investments      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 68 56  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 287 208 $ 188
Level 3 | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 232 152  
Level 3 | Pension Benefits | Fixed-Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 11 9  
Level 3 | Pension Benefits | Alternatives      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 134 125  
Level 3 | Pension Benefits | Other Investments      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 87 18  
Level 3 | Other Postretirement Benefits | Deposit Administration Fund      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 55 56  
Assets Measured at NAV | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets [1] 1,843 1,463  
Assets Measured at NAV | Pension Benefits | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets [1] 832 746  
Assets Measured at NAV | Pension Benefits | Fixed-Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets [1] 463 223  
Assets Measured at NAV | Pension Benefits | Alternatives      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets [1] 452 401  
Assets Measured at NAV | Pension Benefits | Other Investments      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets [1] $ 96 $ 93  
[1] In accordance with the relevant accounting standards, certain investments that are measured at fair value using the NAV per share (or its equivalent) have not been classified in the fair value hierarchy. These investments are commingled funds that invest in fixed-income instruments including bonds, debt securities, and other similar instruments issued by various U.S. and non-U.S. public- or private-sector entities. Redemption periods for these investments range from daily to annually.