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Debt (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Debt Instrument [Line Items] |  |  |  |
Interest and debt expense | $ 73 | $ 66 | $ 204 | $ 218
Capital Securities [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest and debt expense | 8 |  |  |
Line of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Current borrowing capacity | 2,500 |  | 2,500 |
Minimum consolidated net worth | $ 10,000 |  | $ 10,000 |
Percentage of aggregate net proceeds of equity issuances | 50.00% |  | 50.00% |
Debt to capital ratio (low end of range) | 0.35% |  | 0.35% |
Debt to capital ratio (high end of range) | 1.00% |  | 1.00% |
Non-operating indebtedness of subsidiaries to total capitalization, maximum |  |  | 7.50% |

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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69F -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495745-112612 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69E -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495743-112612 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1F -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495355-112611 + Details
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