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Pension and Other Postretirement Plan Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets $ 3,932 $ 3,355 $ 2,975
Assets measured at NAV [1] 2,211 1,843  
Pension Benefits | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 1,406 1,173  
Assets measured at NAV [1] 1,004 832  
Pension Benefits | Fixed-Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 1,470 1,298  
Assets measured at NAV [1] 618 463  
Pension Benefits | Alternatives      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 637 586  
Assets measured at NAV [1] 498 452  
Pension Benefits | Other Investments      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 419 298  
Assets measured at NAV [1] 91 96  
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 54 55 56
Other Postretirement Benefits | Deposit Administration Fund      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 54 55  
Level 1 | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 301 277  
Level 1 | Pension Benefits | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 269 230  
Level 1 | Pension Benefits | Other Investments      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 32 47  
Level 2 | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 1,091 1,003  
Level 2 | Pension Benefits | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 133 111  
Level 2 | Pension Benefits | Fixed-Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 834 824  
Level 2 | Pension Benefits | Other Investments      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 124 68  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 383 287 $ 208
Level 3 | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 329 232  
Level 3 | Pension Benefits | Fixed-Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 18 11  
Level 3 | Pension Benefits | Alternatives      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 139 134  
Level 3 | Pension Benefits | Other Investments      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets 172 87  
Level 3 | Other Postretirement Benefits | Deposit Administration Fund      
Defined Benefit Plan Disclosure [Line Items]      
Pension and other postretirement plan assets $ 54 $ 55  
[1] In accordance with the relevant accounting standards, certain investments that are measured at fair value using the net asset value ("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.