v3.3.1.900
Pension And Other Postretirement Benefits (Change In The Fair Value Of Level 3 Assets) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Pension Benefits - U.S. [Member] | Private Equity [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value at January 1 $ 562 $ 523
Net realized gains/(losses) 1 2
Net unrealized gains/(losses) 106 89
Net purchases/(sales) (74) (52)
Fair value at December 31 595 562
Pension Benefits - Non-U.S. [Member] | Private Equity [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value at January 1 535 502
Net realized gains/(losses) 26 23
Net unrealized gains/(losses) 64 31
Net purchases/(sales) (44) (21)
Fair value at December 31 581 535
Pension Benefits - Non-U.S. [Member] | Real Estate Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value at January 1 57 136
Net realized gains/(losses) (5) (17)
Net unrealized gains/(losses)   8
Net purchases/(sales) (52) (70)
Fair value at December 31   57
Other Postretirement Benefits [Member] | Private Equity [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value at January 1 2 9
Net purchases/(sales) $ (2) (7)
Fair value at December 31   $ 2