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Leases (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) renewal_option	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Operating Leased Assets [Line Items]
Percentage of lease obligations	85.00%
Term of contract	12 months
Renewal term increments	1 year
Operating lease ROU asset amortization	$ 38
Other noncash operating lease costs	16
Rent expense on operating leases under previous lease standard		$ 144	$ 139
Short-term lease commitments	$ 77
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating leases, future minimum payments due		367
2019		76
2020		48
2021		39
2022		32
2023		29
Thereafter		$ 143
Minimum
Operating Leased Assets [Line Items]
Number of renewal options | renewal_option	1

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Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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