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Leases (Schedule of Aggregate Lease Maturities) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Future Minimum Lease Payments For Operating Leases [Abstract]
Minimum operating lease payments - 2020	$ 41
Minimum operating lease payments - 2021	304
Minimum operating lease payments - 2022	269
Minimum operating lease payments - 2023	226
Minimum operating lease payments - 2024	218
Minimum operating lease payments - later years	784
Total operating lease payments	1,842
Operating lease payments - amount representing interest	241
Operating lease liabilities - present value of minimum lease liabilities	1,601
Future Minimum Lease Payments For Finance Leases [Abstract]
Minimum finance lease payments - 2020	15
Minimum finance lease payments - 2021	141
Minimum finance lease payments - 2022	115
Minimum finance lease payments - 2023	81
Minimum finance lease payments - 2024	68
Minimum finance lease payments - later years	122
Total finance lease payments	542
Finance lease payments - amount representing interest	73
Finance lease liabilities - present value of minimum lease liabilities	469
Minimum lease payments - 2020	56
Minimum lease payments - 2021	445
Minimum lease payments - 2022	384
Minimum lease payments - 2023	307
Minimum lease payments - 2024	286
Minimum lease payments - later years	906
Total minimum lease payments	2,384
Lease payments - amount representing interest	314
Total lease liabilities	$ 2,070	$ 2,438

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