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Consolidated Statement of Comprehensive Income (Parenthetical) (Parentheticals) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement of Comprehensive Income [Abstract]        
Foreign currency translation, tax (provision)/benefit $ (3) $ 28 $ (18) $ 86
Pension and other postretirement benefits, Current year actuarial gain (loss), tax (provision)/benefit 0 0 0 0
Pension and other postretirement benefits, Amortization of actuarial (gain) loss, tax (provision)/benefit 0 0 0 0
Pension and other postretirement benefits, Current year prior service credit (cost), tax (provision)/benefit 0 0 1 (4)
Pension and other postretirement benefits, Amortization of prior service (credit) cost, tax (provision)/benefit 2 2 5 6
Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, Tax 0 0    
Derivative financial instruments, Gains (losses) deferred, tax (provision)/benefit (9) 2 (23) (3)
Derivative financial instruments, (Gains) losses reclassified to earnings, tax (provision)/benefit 8 (5) 32 (41)
Available-for-sale securities, Gains (losses) deferred, tax (provision)/benefit $ 0 $ (8) 3 (17)
Available-for-sale securities, (Gains) losses reclassified to earnings, tax (provision)/benefit     $ 0 $ 11