Employee Benefit Plans (Expected Benefit Payments for Company's Pension and Postretirement Plans as well as Expected Medicare Part D Subsidy Receipts Related to Postretirement Plan) (Details) $ in Millions	Dec. 31, 2019 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2020	$ 938
2021	797
2022	825
2023	858
2024	865
2025-2029	4,577
Total	8,860
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
2020	147
2021	148
2022	149
2023	148
2024	146
2025-2029	698
Total	1,436
Other Postretirement Benefits– Medicare Part D Subsidy Receipts
Defined Benefit Plan Disclosure [Line Items]
2020	8
2021	8
2022	8
2023	7
2024	7
2025-2029	32
Total	$ 70

Employee Benefit Plans (Expected Benefit Payments for Company's Pension and Postretirement Plans as well as Expected Medicare Part D Subsidy Receipts Related to Postretirement Plan) (Details)
$ in Millions

Dec. 31, 2019

USD ($)

Defined Benefit Plan Disclosure [Line Items]

$ 938

797

825

858

865

4,577

8,860

Other Postretirement Benefits

Defined Benefit Plan Disclosure [Line Items]

147

148

149

148

146

698

1,436

Other Postretirement Benefits– Medicare Part D Subsidy Receipts

Defined Benefit Plan Disclosure [Line Items]

$ 70

The aggregate amount of benefits expected to be paid in the first, second, third, fourth and fifth fiscal years and the five fiscal years after the fifth fiscal year following the latest fiscal year from a defined benefit plan

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