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Share-based Compensation and Employee Benefits (Schedule of Components of Net Benefit Cost and Other Amounts Recognized in Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Benefits [Member]      
Components of net benefit cost:      
Service cost $ 52 $ 40 $ 36
Interest cost 84 88 89
Expected return on assets (149) (147) (151)
Amortization of prior service cost (credit) 0 1 1
Amortization of net actuarial loss (gain) 40 52 35
Curtailment and settlement loss 0 5 0
Net benefit (credit) cost 27 39 10
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss:      
Net loss (gain) arising during period 105 17 116
Prior service cost (credit) arising during period 0 0 0
Amortization or settlement recognition of net actuarial (loss) gain (87) (64) (34)
Amortization of prior service (cost) credit (1) (1) 0
Exchange rate changes 0 0 1
Total recognized in total other comprehensive (income) loss 17 (48) 83
Total recognized in net benefit cost (credit) and other comprehensive (income) loss 44 (9) 93
OPEB [Member]      
Components of net benefit cost:      
Service cost 1 1 1
Interest cost 12 13 16
Expected return on assets (20) (19) (19)
Amortization of prior service cost (credit) (4) (3) (3)
Amortization of net actuarial loss (gain) (6) (6) 0
Curtailment and settlement loss 0 0 0
Net benefit (credit) cost (17) (14) (5)
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss:      
Net loss (gain) arising during period (32) (25) (48)
Prior service cost (credit) arising during period 0 0 0
Amortization or settlement recognition of net actuarial (loss) gain 3 6 0
Amortization of prior service (cost) credit 3 1 1
Exchange rate changes 0 0 0
Total recognized in total other comprehensive (income) loss (26) (18) (47)
Total recognized in net benefit cost (credit) and other comprehensive (income) loss (43) (32) $ (52)
OPEB [Member] | Other Affiliates [Member]      
Components of net benefit cost:      
Net benefit (credit) cost $ (4) $ (4)