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Leases (Schedule of Aggregate Lease Maturities) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Future Minimum Lease Payments For Operating Leases [Abstract]
Minimum operating lease payments - 2020	$ 103
Minimum operating lease payments - 2021	302
Minimum operating lease payments - 2022	267
Minimum operating lease payments - 2023	225
Minimum operating lease payments - 2024	216
Minimum operating lease payments - later years	781
Total operating lease payments	1,894
Operating lease payments - amount representing interest	255
Operating lease liabilities - present value of minimum lease liabilities	1,639
Future Minimum Lease Payments For Finance Leases [Abstract]
Minimum finance lease payments - 2020	62
Minimum finance lease payments - 2021	142
Minimum finance lease payments - 2022	127
Minimum finance lease payments - 2023	88
Minimum finance lease payments - 2024	75
Minimum finance lease payments - later years	124
Total finance lease payments	618
Finance lease payments - amount representing interest	86
Finance lease liabilities - present value of minimum lease liabilities	532
Minimum lease payments - 2020	165
Minimum lease payments - 2021	444
Minimum lease payments - 2022	394
Minimum lease payments - 2023	313
Minimum lease payments - 2024	291
Minimum lease payments - later years	905
Total minimum lease payments	2,512
Lease payments - amount representing interest	341
Total lease liabilities	$ 2,171	$ 2,438

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