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Benefit Plans (Schedule Of Components Of Net Periodic Pension Cost) (Details) - Pension Plan [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Defined Benefit Plan Disclosure [Line Items]        
Service Cost $ 22 $ 17 $ 65 $ 51
Interest cost 84 86 252 258
Expected return on plan assets (135) (129) (405) (389)
Amortization of net loss 58 36 175 111
Amortization of prior service cost 2 3 6 8
Net Periodic Benefit Cost $ 31 $ 13 $ 93 $ 39